{"id":43616,"date":"2023-07-01T12:18:40","date_gmt":"2024-01-07T12:02:08","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%99%ae%e7%bd%97%e7%b1%b3%e4%bf%ae%e6%96%af-%e7%ac%ac%e4%b8%80%e9%83%a8%e5%88%86%ef%bc%9adiscoverymanager%e5%92%8cscrapemanager\/"},"modified":"2024-04-30T11:29:36","modified_gmt":"2024-04-30T03:29:36","slug":"%e6%99%ae%e7%bd%97%e7%b1%b3%e4%bf%ae%e6%96%af-%e7%ac%ac%e4%b8%80%e9%83%a8%e5%88%86%ef%bc%9adiscoverymanager%e5%92%8cscrapemanager","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%99%ae%e7%bd%97%e7%b1%b3%e4%bf%ae%e6%96%af-%e7%ac%ac%e4%b8%80%e9%83%a8%e5%88%86%ef%bc%9adiscoverymanager%e5%92%8cscrapemanager\/","title":{"rendered":"\u666e\u7f57\u7c73\u4fee\u65af \u7b2c\u4e00\u90e8\u5206\uff1aDiscoveryManager\u548cScrapeManager"},"content":{"rendered":"

\u9996\u5148<\/h1>\n

Prometheus\u88ab\u5e7f\u6cdb\u7528\u4f5c\u4e3a\u4e00\u79cd\u7075\u6d3b\u7684\u5f00\u6e90\u76d1\u63a7\u5de5\u5177\uff0c\u7528\u4e8e\u6536\u96c6\u6307\u6807\u6570\u636e\u3001\u8bbe\u7f6e\u8b66\u62a5\uff0c\u5e76\u4e14\u8fd8\u6210\u4e3a\u4e86CNCF\u7684\u6bd5\u4e1a\u9879\u76ee\u3002<\/p>\n

\u5728\u672c\u7bc7\uff08\u7b2c\u4e00\u90e8\uff09\u4e2d\uff0c\u7b80\u5355\u4ecb\u7ecd\u4e86Prometheus\u7684\u57fa\u672c\u8fd0\u4f5c\u65b9\u5f0f\u3002\u8fd9\u4efd\u7b14\u8bb0\u662f\u6211\u57fa\u4e8e\u4e2a\u4eba\u5174\u8da3\u6240\u9605\u8bfb\u7684\uff0c\u5e0c\u671b\u80fd\u5e2e\u52a9\u5176\u4ed6\u5bf9\u76f8\u4f3c\u5185\u5bb9\u611f\u5174\u8da3\u7684\u4eba\u66f4\u597d\u5730\u628a\u63e1\u6574\u4f53\u6982\u51b5\u3002<\/p>\n

\u603b\u4f53\u6765\u8bf4\uff0c\u611f\u89c9\u5c31\u50cf\u4e0b\u56fe\u6240\u793a\uff08\u7a0d\u5fae\u6709\u4e9b\u96f6\u4e71\uff09\u3002\u8fd9\u6b21\u4e3b\u8981\u5173\u6ce8 Discovery \u548c Scape \u90e8\u5206\u3002 WebUI\u3001PromQL\u3001AlertManager\u3001Storage\u7b49\u7b49\u8fd9\u4e9b\u90e8\u5206\uff0c\u672c\u6b21\uff08\u76ee\u524d\uff09\u7701\u7565\u3002<\/p>\n

\"prometheus.png\"<\/div>\n

\u7ec4\u4ef6<\/h1>\n

\u9996\u5148\u7b80\u8981\u4ecb\u7ecd\u63a5\u4e0b\u6765\u51fa\u73b0\u7684\u7ec4\u4ef6:<\/p>\n

    \n
  1. \n
      \u76ee\u6807\uff1aPrometheus\u6293\u53d6\u7684\u5bf9\u8c61<\/ol>\n<\/li>\n<\/ol>\n

      \u53d1\u73b0\u7ba1\u7406\u5668\uff1a\u7ba1\u7406\u670d\u52a1\u53d1\u73b0\uff08SD\uff09\u3002\u6bcf\u4e2aSD\u7684\u4efb\u52a1\u662f\u4ece\u914d\u7f6e\u6587\u4ef6\u4e2d\u66f4\u65b0\u76ee\u6807\u3002<\/p>\n

      \u63d0\u4f9b\u8005\uff1a\u670d\u52a1\u53d1\u73b0\u7684\u7c7b\u578b\uff08\u4f8b\u5982kubernetes\uff0cazure\uff09\u3002<\/p>\n

      \u53d1\u73b0\u5668\uff1a\u5404\u4e2aSD\u7684\u5b9e\u73b0<\/p>\n

      \u6293\u53d6\u7ba1\u7406\u5668\uff1a\u7ba1\u7406\u6293\u53d6\u6c60\u7684\u96c6\u5408\uff0c\u5e76\u5728\u76ee\u6807\u7531\u53d1\u73b0\u7ba1\u7406\u5668\u66f4\u65b0\u65f6\u8fdb\u884c\u76f8\u5e94\u7684\u66f4\u65b0\u3002<\/p>\n

      \u6293\u53d6\u6c60\uff1a\u5c06\u76ee\u6807\u7ec4\u8f6c\u6362\u4e3a\u5b9e\u9645\u7684\u6293\u53d6\u5bf9\u8c61\u3002\u53e6\u5916\uff0c\u6293\u53d6\u6c60\u5177\u6709\u591a\u4e2a\u6293\u53d6\u5668\u3002<\/p>\n

      \u6293\u53d6\u5668\uff1a<\/p>\n

      TSDB\uff1a\u5b58\u50a8\u5ea6\u91cf\u6570\u636e\u7684\u6570\u636e\u5e93\uff08\u4e0e\u5b58\u50a8\u76f8\u5173\u7684\u5185\u5bb9\u4e0d\u5728\u672c\u6b21\u8ba8\u8bba\u8303\u56f4\u5185\uff09\u3002<\/p>\n

      \u6574\u4f53\u7684\u8d8b\u52bf<\/h1>\n
        \n
      1. \n
          \u521d\u59cb\u5316Manager\u7c7b\u3002<\/ol>\n<\/li>\n<\/ol>\n

          \u8bbe\u7f6ereloader\u53d8\u91cf\u4e3areloader\u3002<\/p>\n

          \u5e94\u7528scrapeManager\u7684\u914d\u7f6e\u3002<\/p>\n

          \u5e94\u7528notificationManager\u7684\u914d\u7f6e\u3002<\/p>\n

          \u5e94\u7528discoveryManagerScrape\u7684\u914d\u7f6e\u3002<\/p>\n

          \u5176\u4ed6\u3002<\/p>\n

          \u5c06\u5404\u4e2aManager\u7684Run()\u548creload\u5904\u7406\u5668\u8bbe\u7f6e\u5230run.Group\u4e2d\u3002<\/p>\n

          \u901a\u8fc7g.Run()\u6267\u884c\u6ce8\u518c\u7684RunGroup\uff0c\u5f00\u59cb\u6240\u6709\u64cd\u4f5c\u3002<\/p>\n

          \u5173\u4e8e\u670d\u52a1\u53d1\u73b0<\/h1>\n

          \u670d\u52a1\u53d1\u73b0\u662f\u7531DiscoveryManager\u7ba1\u7406\u7684\u63d0\u4f9b\u8005\uff08\u5982kubernetes\u3001http\u7b49ScrapeConfig\u7684\u7c7b\u578b\uff09\u8fdb\u884c\u53d1\u73b0\u7684\u3002\u6709\u4e24\u4e2a\u91cd\u8981\u7684\u70b9\uff0c\u5373Run\u548creloader\u3002\u5206\u522b\u4ecb\u7ecd\u5982\u4e0b\u3002<\/p>\n

          \u8dd1()<\/h2>\n

          DiscoveryManager\u662f\u5728prometheus\/main.go\u6587\u4ef6\u4e2d\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u5e76\u5728Run()\u51fd\u6570\u4e2d\u542f\u52a8\u65f6\u8c03\u7528sender()\u51fd\u6570\u3002<\/p>\n

          func<\/span> (<\/span>m<\/span> *<\/span>Manager<\/span>)<\/span> Run<\/span>()<\/span> error<\/span> {<\/span>\r\n    go<\/span> m<\/span>.<\/span>sender<\/span>()<\/span>\r\n    for<\/span> range<\/span> m<\/span>.<\/span>ctx<\/span>.<\/span>Done<\/span>()<\/span> {<\/span>\r\n        m<\/span>.<\/span>cancelDiscoverers<\/span>()<\/span>\r\n        return<\/span> m<\/span>.<\/span>ctx<\/span>.<\/span>Err<\/span>()<\/span>\r\n    }<\/span>\r\n    return<\/span> nil<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
          \u5982\u679c\u8fd9\u4e2asender\u5728For\u5faa\u73af\u4e2d\uff0c\u5f53triggerSend\u901a\u9053\u4e0a\u5b58\u5728\u6d88\u606f\u65f6\uff0c\u5b83\u4f1a\u5411m.syncCh\u53d1\u9001m.allGroups()\u3002 (\u5bf9\u4e8e\u4e0d\u77e5\u9053Go\u8bed\u8a00\u4e2d\u7684<-\u64cd\u4f5c\u7b26\u7684\u4eba\uff0c\u8bf7\u53c2\u8003\u901a\u9053\u7684\u5f15\u7528)<\/p>\n
          func<\/span> (<\/span>m<\/span> *<\/span>Manager<\/span>)<\/span> sender<\/span>()<\/span> {<\/span>\r\n    ticker<\/span> :=<\/span> time<\/span>.<\/span>NewTicker<\/span>(<\/span>m<\/span>.<\/span>updatert<\/span>)<\/span>\r\n    defer<\/span> ticker<\/span>.<\/span>Stop<\/span>()<\/span>\r\n\r\n    for<\/span> {<\/span>\r\n        select<\/span> {<\/span>\r\n        case<\/span> <-<\/span>m<\/span>.<\/span>ctx<\/span>.<\/span>Done<\/span>()<\/span>:<\/span>\r\n            return<\/span>\r\n        case<\/span> <-<\/span>ticker<\/span>.<\/span>C<\/span>:<\/span> \/\/ Some discoverers send updates too often so we throttle these with the ticker.<\/span>\r\n            select<\/span> {<\/span>\r\n            case<\/span> <-<\/span>m<\/span>.<\/span>triggerSend<\/span>:<\/span> \/\/ triggerSend \u30c1\u30e3\u30f3\u30cd\u30eb\u306b\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u3042\u308c\u3070<\/span>\r\n                sentUpdates<\/span>.<\/span>WithLabelValues<\/span>(<\/span>m<\/span>.<\/span>name<\/span>)<\/span>.<\/span>Inc<\/span>()<\/span> \/\/ sentUpdates\u30e1\u30c8\u30ea\u30af\u30b9\u3092\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8<\/span>\r\n                select<\/span> {<\/span>\r\n                case<\/span> m<\/span>.<\/span>syncCh<\/span> <-<\/span> m<\/span>.<\/span>allGroups<\/span>()<\/span>:<\/span> \/\/ allGroups()\u3067 targetgroups\u3092 syncCh \u30c1\u30e3\u30f3\u30cd\u30eb\u306b\u9001\u4fe1<\/span>\r\n                default<\/span>:<\/span>\r\n                    delayedUpdates<\/span>.<\/span>WithLabelValues<\/span>(<\/span>m<\/span>.<\/span>name<\/span>)<\/span>.<\/span>Inc<\/span>()<\/span>\r\n                    level<\/span>.<\/span>Debug<\/span>(<\/span>m<\/span>.<\/span>logger<\/span>)<\/span>.<\/span>Log<\/span>(<\/span>\"msg\"<\/span>,<\/span> \"Discovery receiver's channel was full so will retry the next cycle\"<\/span>)<\/span>\r\n                    select<\/span> {<\/span>\r\n                    case<\/span> m<\/span>.<\/span>triggerSend<\/span> <-<\/span> struct<\/span>{}{}<\/span>:<\/span> \/\/ \u6b21\u306eLoop\u3067\u3082\u3046\u4e00\u5ea6\u66f4\u65b0\u3059\u308b\u3088\u3046\u306btriggerSend\u306b\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u4fe1<\/span>\r\n                    default<\/span>:<\/span>\r\n                    }<\/span>\r\n                }<\/span>\r\n            default<\/span>:<\/span>\r\n            }<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
          \u5f53\u89e6\u53d1\u5668\u51fd\u6570\uff08triggerSend\uff09\u5728updater()\u7684\u5faa\u73af\u4e2d\u53d1\u751f\u66f4\u6539\u65f6\uff0c\u5c06\u53d1\u9001\u4e00\u6761\u6d88\u606f\u3002<\/p>\n
          func<\/span> (<\/span>m<\/span> *<\/span>Manager<\/span>)<\/span> updater<\/span>(<\/span>ctx<\/span> context<\/span>.<\/span>Context<\/span>,<\/span> p<\/span> *<\/span>provider<\/span>,<\/span> updates<\/span> chan<\/span> []<\/span>*<\/span>targetgroup<\/span>.<\/span>Group<\/span>)<\/span> {<\/span>\r\n    for<\/span> {<\/span>\r\n        select<\/span> {<\/span>\r\n        case<\/span> <-<\/span>ctx<\/span>.<\/span>Done<\/span>()<\/span>:<\/span>\r\n            return<\/span>\r\n        case<\/span> tgs<\/span>,<\/span> ok<\/span> :=<\/span> <-<\/span>updates<\/span>:<\/span> \/\/ updates \u304c\u3042\u3063\u305f\u3089<\/span>\r\n            receivedUpdates<\/span>.<\/span>WithLabelValues<\/span>(<\/span>m<\/span>.<\/span>name<\/span>)<\/span>.<\/span>Inc<\/span>()<\/span> \/\/ receiveUpdates\u3092\u30a4\u30f3\u30af\u30ea\u30e1\u30f3\u30c8<\/span>\r\n            if<\/span> !<\/span>ok<\/span> {<\/span>\r\n                level<\/span>.<\/span>Debug<\/span>(<\/span>m<\/span>.<\/span>logger<\/span>)<\/span>.<\/span>Log<\/span>(<\/span>\"msg\"<\/span>,<\/span> \"Discoverer channel closed\"<\/span>,<\/span> \"provider\"<\/span>,<\/span> p<\/span>.<\/span>name<\/span>)<\/span>\r\n                return<\/span>\r\n            }<\/span>\r\n\r\n            for<\/span> _<\/span>,<\/span> s<\/span> :=<\/span> range<\/span> p<\/span>.<\/span>subs<\/span> {<\/span> \/\/ provider\u306eSubsucribers \u540c\u3058Provider\u306b\u7d10\u3065\u304fscrape job\u305f\u3061\u306b\u305f\u3044\u3057\u3066<\/span>\r\n                m<\/span>.<\/span>updateGroup<\/span>(<\/span>poolKey<\/span>{<\/span>setName<\/span>:<\/span> s<\/span>,<\/span> provider<\/span>:<\/span> p<\/span>.<\/span>name<\/span>},<\/span> tgs<\/span>)<\/span> \/\/ targetgroup.Group\u3092\u66f4\u65b0 setName\u306fconfiguration\u306ejob_name\u3068prover.name\u306f `kubernetes`, `http`\u306a\u3069 <\/span>\r\n            }<\/span>\r\n\r\n            select<\/span> {<\/span>\r\n            case<\/span> m<\/span>.<\/span>triggerSend<\/span> <-<\/span> struct<\/span>{}{}<\/span>:<\/span> \/\/ triggerSend\u306b\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u9001\u4fe1<\/span>\r\n            default<\/span>:<\/span>\r\n            }<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
          \u8fd9\u4e2a\u66f4\u65b0\u5668\uff08updater\uff09\u662f\u901a\u8fc7\u53c2\u6570\u53ef\u77e5\u7684\uff0c\u4ed6\u88ab\u8c03\u7528\u7ed9\u63d0\u4f9b\u8005\uff08provider\uff09\uff0c\u5e76\u5728startProvider()\u4e2d\u8c03\u7528\u3002<\/p>\n
          func<\/span> (<\/span>m<\/span> *<\/span>Manager<\/span>)<\/span> startProvider<\/span>(<\/span>ctx<\/span> context<\/span>.<\/span>Context<\/span>,<\/span> p<\/span> *<\/span>provider<\/span>)<\/span> {<\/span>\r\n    level<\/span>.<\/span>Debug<\/span>(<\/span>m<\/span>.<\/span>logger<\/span>)<\/span>.<\/span>Log<\/span>(<\/span>\"msg\"<\/span>,<\/span> \"Starting provider\"<\/span>,<\/span> \"provider\"<\/span>,<\/span> p<\/span>.<\/span>name<\/span>,<\/span> \"subs\"<\/span>,<\/span> fmt<\/span>.<\/span>Sprintf<\/span>(<\/span>\"%v\"<\/span>,<\/span> p<\/span>.<\/span>subs<\/span>))<\/span>\r\n    ctx<\/span>,<\/span> cancel<\/span> :=<\/span> context<\/span>.<\/span>WithCancel<\/span>(<\/span>ctx<\/span>)<\/span>\r\n    updates<\/span> :=<\/span> make<\/span>(<\/span>chan<\/span> []<\/span>*<\/span>targetgroup<\/span>.<\/span>Group<\/span>)<\/span>\r\n\r\n    m<\/span>.<\/span>discoverCancel<\/span> =<\/span> append<\/span>(<\/span>m<\/span>.<\/span>discoverCancel<\/span>,<\/span> cancel<\/span>)<\/span>\r\n\r\n    go<\/span> p<\/span>.<\/span>d<\/span>.<\/span>Run<\/span>(<\/span>ctx<\/span>,<\/span> updates<\/span>)<\/span>\r\n    go<\/span> m<\/span>.<\/span>updater<\/span>(<\/span>ctx<\/span>,<\/span> p<\/span>,<\/span> updates<\/span>)<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
          startProvider\u662f\u4e00\u4e2a\u51fd\u6570\u3002<\/p>\n
            \n
          1. \n
              \u521b\u5efa\u4e00\u4e2a\u901a\u9053\uff0c\u5176\u4e2d\u8981\u5b58\u653e\u7c7b\u578b\u4e3atargetgroup.Group\u7684\u6570\u7ec4\u547d\u540d\u4e3aupdates\u3002<\/ol>\n<\/li>\n<\/ol>\n
               <\/p>\n
                \n
              1. \n
                  \u8c03\u7528Discoverer\u7684Run(ctx, updates)\u6765\u5bf9\u5e94provider\u3002<\/ol>\n<\/li>\n<\/ol>\n
                  \u8c03\u7528updater(ctx, p, updates)\u3002<\/p>\n
                  \u5f53Discover\u7684Run\u548cupdater\u4f20\u9012\u76f8\u540c\u7684\u901a\u9053\u65f6\uff0cDiscoverer\u53d1\u73b0\u76ee\u6807\u7ec4\u5e76\u5c06\u5176\u66f4\u65b0\u4e3aupdates\uff0c\u7136\u540e\u5728updater()\u51fd\u6570\u4e2d\u8c03\u7528Manager\u7684updateGroup\u65b9\u6cd5\u3002<\/p>\n
                  \u5728\u6b64\u65f6\uff0c\u8fd8\u6ca1\u6709\u8c03\u7528startProvider\u3002\u5b83\u5c06\u5728reloader\u4e2d\u88ab\u8c03\u7528\u3002<\/p>\n
                  \u91cd\u65b0\u52a0\u8f7d\u5668\uff08\u5e94\u7528\u914d\u7f6e\uff09<\/h2>\n
                  reloader \u5728 prometheus\/main.go \u6587\u4ef6\u4e2d\uff0c\u5b9a\u4e49\u4e86\u4e00\u4e2a reloaders \u7684\u96c6\u5408\uff0c\u5728 Initial configuration loading \u9636\u6bb5\u65f6\u4f1a\u901a\u8fc7 reloadConfig() \u65b9\u6cd5\u8fdb\u884c\u8c03\u7528\u3002<\/p>\n
                  DiscoveryManager\u7684reloader\u662f\u901a\u8fc7discoveryManagerScrape.ApplyConfig(c)\u5b9e\u73b0\u7684\u3002c\u662f\u4e00\u4e2ascrape_config\u7684\u5185\u5bb9\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u4e2a\u4ee5JobName\u4e3a\u952e\u3001\u4ee5ServiceDiscoveryConfigs\u4e3a\u503c\u7684\u6620\u5c04\u3002<\/p>\n
                          },<\/span> {<\/span>\r\n            name<\/span>:<\/span> \"scrape_sd\"<\/span>,<\/span>\r\n            reloader<\/span>:<\/span> func<\/span>(<\/span>cfg<\/span> *<\/span>config<\/span>.<\/span>Config<\/span>)<\/span> error<\/span> {<\/span>\r\n                c<\/span> :=<\/span> make<\/span>(<\/span>map<\/span>[<\/span>string<\/span>]<\/span>discovery<\/span>.<\/span>Configs<\/span>)<\/span>\r\n                for<\/span> _<\/span>,<\/span> v<\/span> :=<\/span> range<\/span> cfg<\/span>.<\/span>ScrapeConfigs<\/span> {<\/span>\r\n                    c<\/span>[<\/span>v<\/span>.<\/span>JobName<\/span>]<\/span> =<\/span> v<\/span>.<\/span>ServiceDiscoveryConfigs<\/span>\r\n                }<\/span>\r\n                return<\/span> discoveryManagerScrape<\/span>.<\/span>ApplyConfig<\/span>(<\/span>c<\/span>)<\/span>\r\n            },<\/span>\r\n<\/code><\/pre>\n
                  \u90a3\u4e48\uff0c\u8ba9\u6211\u4eec\u6765\u770b\u770b\u5e94\u7528\u914d\u7f6e(cfg)\u3002<\/p>\n
                  \/\/ ApplyConfig removes all running discovery providers and starts new ones using the provided config.<\/span>\r\nfunc<\/span> (<\/span>m<\/span> *<\/span>Manager<\/span>)<\/span> ApplyConfig<\/span>(<\/span>cfg<\/span> map<\/span>[<\/span>string<\/span>]<\/span>Configs<\/span>)<\/span> error<\/span> {<\/span>\r\n    m<\/span>.<\/span>mtx<\/span>.<\/span>Lock<\/span>()<\/span>\r\n    defer<\/span> m<\/span>.<\/span>mtx<\/span>.<\/span>Unlock<\/span>()<\/span>\r\n\r\n    for<\/span> pk<\/span> :=<\/span> range<\/span> m<\/span>.<\/span>targets<\/span> {<\/span>\r\n        if<\/span> _<\/span>,<\/span> ok<\/span> :=<\/span> cfg<\/span>[<\/span>pk<\/span>.<\/span>setName<\/span>];<\/span> !<\/span>ok<\/span> {<\/span>\r\n            discoveredTargets<\/span>.<\/span>DeleteLabelValues<\/span>(<\/span>m<\/span>.<\/span>name<\/span>,<\/span> pk<\/span>.<\/span>setName<\/span>)<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n    m<\/span>.<\/span>cancelDiscoverers<\/span>()<\/span>\r\n    m<\/span>.<\/span>targets<\/span> =<\/span> make<\/span>(<\/span>map<\/span>[<\/span>poolKey<\/span>]<\/span>map<\/span>[<\/span>string<\/span>]<\/span>*<\/span>targetgroup<\/span>.<\/span>Group<\/span>)<\/span>\r\n    m<\/span>.<\/span>providers<\/span> =<\/span> nil<\/span>\r\n    m<\/span>.<\/span>discoverCancel<\/span> =<\/span> nil<\/span>\r\n\r\n    failedCount<\/span> :=<\/span> 0<\/span>\r\n    for<\/span> name<\/span>,<\/span> scfg<\/span> :=<\/span> range<\/span> cfg<\/span> {<\/span>\r\n        failedCount<\/span> +=<\/span> m<\/span>.<\/span>registerProviders<\/span>(<\/span>scfg<\/span>,<\/span> name<\/span>)<\/span>\r\n        discoveredTargets<\/span>.<\/span>WithLabelValues<\/span>(<\/span>m<\/span>.<\/span>name<\/span>,<\/span> name<\/span>)<\/span>.<\/span>Set<\/span>(<\/span>0<\/span>)<\/span>\r\n    }<\/span>\r\n    failedConfigs<\/span>.<\/span>WithLabelValues<\/span>(<\/span>m<\/span>.<\/span>name<\/span>)<\/span>.<\/span>Set<\/span>(<\/span>float64<\/span>(<\/span>failedCount<\/span>))<\/span>\r\n\r\n    for<\/span> _<\/span>,<\/span> prov<\/span> :=<\/span> range<\/span> m<\/span>.<\/span>providers<\/span> {<\/span>\r\n        m<\/span>.<\/span>startProvider<\/span>(<\/span>m<\/span>.<\/span>ctx<\/span>,<\/span> prov<\/span>)<\/span>\r\n    }<\/span>\r\n\r\n    return<\/span> nil<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                    \n
                  1. \n
                      \u53d6\u6d88\u53d1\u73b0\u8005 (cancelDiscoverers())<\/ol>\n<\/li>\n<\/ol>\n
                       <\/p>\n
                        \n
                      1. \n
                          \u6839\u636e\u6bcf\u4e2a\u914d\u7f6e (config) \u5728 registerProviders() \u4e2d\u6ce8\u518c\u63d0\u4f9b\u8005 (provider\u767b\u8bb0)<\/ol>\n<\/li>\n<\/ol>\n
                           <\/p>\n
                            \u9488\u5bf9\u6bcf\u4e2a\u63d0\u4f9b\u8005 (provider) \u542f\u52a8 (startProvider())<\/ol>\n
                            \u6700\u540e\u5728Run\u51fd\u6570\u4e2d\uff0c\u6700\u8fd1\u770b\u5230\u7684startProvider\u88ab\u8c03\u7528\uff0c\u5e76\u4e0eupdater()\u51fd\u6570\u8fde\u63a5\u5728\u4e00\u8d77\u3002<\/p>\n
                            registerProviders\u4f1a\u6839\u636e\u63a5\u6536\u5230\u7684configuration\u6765\u4e3a\u6bcf\u79cd\u9700\u8981\u76d1\u89c6\u7684Service Discovery\u7c7b\u578b\u521b\u5efaprovider\uff0c\u5e76\u901a\u8fc7\u76f8\u540c\u7684provider\u53ef\u4ee5\u67e5\u770b\u591a\u4e2a\u76ee\u6807\uff0c\u6bcf\u4e2ajobName\u5c06\u88ab\u653e\u5165\u5bf9\u5e94provider\u7684subs\u5217\u8868\u4e2d\u3002<\/p>\n
                            startProvider\u4f1a\u4ee5goroutine\u65b9\u5f0f\u8fd0\u884c\u4e0e\u5176\u5bf9\u5e94\u7684discoverer\u7684Run\u548cupdater\uff0c\u5c31\u50cf\u4e0a\u9762\u6240\u770b\u5230\u7684\u4e00\u6837\u3002<\/p>\n
                            \u5728\u6b64\u4e4b\u524d\uff0c\u53ef\u4ee5\u7406\u89e3\u4eceScrapeConfig\u66f4\u65b0TargetGroups\u7684\u6574\u4f53\u6d41\u7a0b\u3002<\/p>\n
                            \"prometheus-discovery-manager.png\"<\/div>\n
                            \u6700\u540e\uff0c\u53d8\u91cf m.Targets \u4e2d\u5b58\u50a8\u4e86\u76ee\u6807\uff0c\u4f46\u7531\u4e8e\u5728\u4ece Discover Manager \u5230 Scraper Manager \u4f20\u9012\u65f6\u53d1\u751f\u4e86\u66f4\u6539\uff0c\u56e0\u6b64\u9700\u8981\u660e\u786e\u6307\u5b9a\u7c7b\u578b\u3002\uff08\u5173\u4e8e Scraper Manager \u7684\u8be6\u7ec6\u4fe1\u606f\u5728\u4e0b\u4e00\u7ae0\u4e2d\u89e3\u91ca\uff09\u3002<\/p>\n
                            \u9996\u5148\uff0ctargetgroup.Group \u7684\u5b9a\u4e49\u5982\u4e0b\uff0c\u5305\u62ec Targets\u3001Labels \u548c Source\u3002<\/p>\n
                            \/\/ Group is a set of targets with a common label set(production , test, staging etc.).<\/span>\r\ntype<\/span> Group<\/span> struct<\/span> {<\/span>\r\n    \/\/ Targets is a list of targets identified by a label set. Each target is<\/span>\r\n    \/\/ uniquely identifiable in the group by its address label.<\/span>\r\n    Targets<\/span> []<\/span>model<\/span>.<\/span>LabelSet<\/span>\r\n    \/\/ Labels is a set of labels that is common across all targets in the group.<\/span>\r\n    Labels<\/span> model<\/span>.<\/span>LabelSet<\/span>\r\n\r\n    \/\/ Source is an identifier that describes a group of targets.<\/span>\r\n    Source<\/span> string<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                            \u4e0b\u4e00\u4e2a\u662fm.Targets\uff0c\u5176\u5728Manager\u7c7b\u578b\u4e2d\u4e5f\u5b58\u5728\u3002<\/p>\n
                                \/\/ Some Discoverers(eg. k8s) send only the updates for a given target group<\/span>\r\n    \/\/ so we use map[tg.Source]*targetgroup.Group to know which group to update.<\/span>\r\n    targets<\/span> map<\/span>[<\/span>poolKey<\/span>]<\/span>map<\/span>[<\/span>string<\/span>]<\/span>*<\/span>targetgroup<\/span>.<\/span>Group<\/span>\r\n<\/code><\/pre>\n
                            \u4ee5\u4e0b\u662fpoolKey\u3002<\/p>\n
                            type<\/span> poolKey<\/span> struct<\/span> {<\/span>\r\n    setName<\/span>  string<\/span>\r\n    provider<\/span> string<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                            \u5982\u679c\u9700\u8981\u66f4\u5177\u4f53\u5730\u786e\u5b9aTargets\uff0c\u5b83\u53ef\u4ee5\u88ab\u63cf\u8ff0\u4e3a\u4ee5\u4e0b\u4e24\u4e2a\u9636\u6bb5\u7684Map\u3002<\/p>\n
                            DiscoveryManager.Targets: poolKey (setName\u548cprovider) \u2192 tg.Source \u2192 *targetgroup.Group<\/p>\n
                            DiscoveryManager\u76ee\u6807: poolKey (\u8bbe\u7f6e\u540d\u79f0\u548c\u63d0\u4f9b\u8005) \u2192 tg.Source \u2192 *targetgroup.Group<\/p>\n
                            \u5f53\u8fd9\u4e2a\u88ab\u4f20\u9012\u7ed9Scrape Manager\u65f6\uff0c\u5728allGroups()\u65b9\u6cd5\u4e2d\uff0cMap\u4ee5Source\u4f5c\u4e3a\u952e\u88ab\u5c55\u5f00\u5e76\u8f6c\u6362\u4e3aList\u3002<\/p>\n
                            ScrapeManager.tsets: setName \u2192 []*targetgroup.Group
                            \nScrapeManager.tsets: setName\uff08\u8bbe\u7f6e\u540d\u79f0\uff09 \u2192 []*targetgroup.Group\uff08\u76ee\u6807\u7fa4\u7ec4\u5217\u8868\uff09<\/p>\n
                            func<\/span> (<\/span>m<\/span> *<\/span>Manager<\/span>)<\/span> allGroups<\/span>()<\/span> map<\/span>[<\/span>string<\/span>][]<\/span>*<\/span>targetgroup<\/span>.<\/span>Group<\/span> {<\/span>\r\n    m<\/span>.<\/span>mtx<\/span>.<\/span>RLock<\/span>()<\/span>\r\n    defer<\/span> m<\/span>.<\/span>mtx<\/span>.<\/span>RUnlock<\/span>()<\/span>\r\n\r\n    tSets<\/span> :=<\/span> map<\/span>[<\/span>string<\/span>][]<\/span>*<\/span>targetgroup<\/span>.<\/span>Group<\/span>{}<\/span>\r\n    n<\/span> :=<\/span> map<\/span>[<\/span>string<\/span>]<\/span>int<\/span>{}<\/span>\r\n    for<\/span> pkey<\/span>,<\/span> tsets<\/span> :=<\/span> range<\/span> m<\/span>.<\/span>targets<\/span> {<\/span>\r\n        for<\/span> _<\/span>,<\/span> tg<\/span> :=<\/span> range<\/span> tsets<\/span> {<\/span>\r\n            \/\/ Even if the target group 'tg' is empty we still need to send it to the 'Scrape manager'<\/span>\r\n            \/\/ to signal that it needs to stop all scrape loops for this target set.<\/span>\r\n            tSets<\/span>[<\/span>pkey<\/span>.<\/span>setName<\/span>]<\/span> =<\/span> append<\/span>(<\/span>tSets<\/span>[<\/span>pkey<\/span>.<\/span>setName<\/span>],<\/span> tg<\/span>)<\/span>\r\n            n<\/span>[<\/span>pkey<\/span>.<\/span>setName<\/span>]<\/span> +=<\/span> len<\/span>(<\/span>tg<\/span>.<\/span>Targets<\/span>)<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n    for<\/span> setName<\/span>,<\/span> v<\/span> :=<\/span> range<\/span> n<\/span> {<\/span>\r\n        discoveredTargets<\/span>.<\/span>WithLabelValues<\/span>(<\/span>m<\/span>.<\/span>name<\/span>,<\/span> setName<\/span>)<\/span>.<\/span>Set<\/span>(<\/span>float64<\/span>(<\/span>v<\/span>))<\/span>\r\n    }<\/span>\r\n    return<\/span> tSets<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                            \u96be\u7684\u662f\uff0c\u6e90\u81ea\u4e8e\u8fd9\u4e2aTargets\u7684\u662f\u5c06 updates \u901a\u9053 (chan []*targetgroup.Group) \u4f20\u9012\u7ed9Discoverer\uff0c\u6bcf\u4e2aDiscoverer\u90fd\u4f1a\u53d1\u9001\u6d88\u606f\uff0c\u56e0\u6b64\u8be6\u7ec6\u7684\u5b9e\u73b0\u5728\u76ee\u524d\u662f\u770b\u4e0d\u89c1\u7684\u3002<\/p>\n
                            \u5173\u4e8eScrape<\/h1>\n
                            ScrapeManager\u8d1f\u8d23\u7ba1\u7406\u591a\u4e2aScrapePool\uff0c\u6bcf\u4e2aScrapePool\u90fd\u6709\u4e00\u4e2aScrapeLoop\u3002<\/p>\n
                            \u4e0eService Discovery\u51e0\u4e4e\u76f8\u540c\uff0c\u6211\u4eec\u5c06\u67e5\u770bManager\u7684Run\u548c reloader\u3002<\/p>\n
                            \u8dd1\u6b65\uff08\uff09<\/h2>\n
                            \u8fd0\u884c(tsets <-chan map[string][]*targetgroup.Group)<\/p>\n
                            \u5f53Run\u5f00\u59cb\u65f6\uff0ctsets\u53c2\u6570\u4f5c\u4e3a\u4e00\u4e2a\u63a5\u6536\u901a\u9053\uff0c\u5305\u542b\u4e86\u4e00\u4e2a\u5305\u542b\u76ee\u6807\u7ec4\u6620\u5c04\u7684\u5730\u56fe\u3002<\/p>\n
                            \u770b\u4e00\u4e0bprometheus\/main.go\u4e2d\u8c03\u7528Run\u7684\u90e8\u5206\u3002<\/p>\n
                                    \/\/ Scrape manager.<\/span>\r\n        g<\/span>.<\/span>Add<\/span>(<\/span>\r\n            func<\/span>()<\/span> error<\/span> {<\/span>\r\n                \/\/ When the scrape manager receives a new targets list<\/span>\r\n                \/\/ it needs to read a valid config for each job.<\/span>\r\n                \/\/ It depends on the config being in sync with the discovery manager so<\/span>\r\n                \/\/ we wait until the config is fully loaded.<\/span>\r\n                <-<\/span>reloadReady<\/span>.<\/span>C<\/span>\r\n\r\n                err<\/span> :=<\/span> scrapeManager<\/span>.<\/span>Run<\/span>(<\/span>discoveryManagerScrape<\/span>.<\/span>SyncCh<\/span>())<\/span>\r\n                level<\/span>.<\/span>Info<\/span>(<\/span>logger<\/span>)<\/span>.<\/span>Log<\/span>(<\/span>\"msg\"<\/span>,<\/span> \"Scrape manager stopped\"<\/span>)<\/span>\r\n                return<\/span> err<\/span>\r\n            },<\/span>\r\n            func<\/span>(<\/span>err<\/span> error<\/span>)<\/span> {<\/span>\r\n                \/\/ Scrape manager needs to be stopped before closing the local TSDB<\/span>\r\n                \/\/ so that it doesn't try to write samples to a closed storage.<\/span>\r\n                level<\/span>.<\/span>Info<\/span>(<\/span>logger<\/span>)<\/span>.<\/span>Log<\/span>(<\/span>\"msg\"<\/span>,<\/span> \"Stopping scrape manager...\"<\/span>)<\/span>\r\n                scrapeManager<\/span>.<\/span>Stop<\/span>()<\/span>\r\n            },<\/span>\r\n        )<\/span>\r\n<\/code><\/pre>\n
                            \u8fd0\u884c scrapeManager.Run(discoveryManagerScrape.SyncCh()) \u5e76\u4e14\u53ef\u4ee5\u770b\u51fa discoveryManagerScrape.SyncCh() \u662f\u4f5c\u4e3a\u53c2\u6570\u8fd4\u56de\u7684\u3002 (discoveryManagerScrape \u662f\u7528\u4e8e\u522e\u53d6\u7684\u53d1\u73b0\u7ba1\u7406\u5668\uff0c\u8fd8\u6709\u4e00\u4e2a\u7528\u4e8e\u901a\u77e5\u7684discoveryManagerNotify\u3002)<\/p>\n
                            \u5728\u53d1\u73b0\u7ba1\u7406\u5668\u4e2d\uff0cSyncCh\u662f\u4e00\u4e2a\u719f\u6089\u7684\u53d8\u91cf\u540d\uff01<\/p>\n
                            func<\/span> (<\/span>m<\/span> *<\/span>Manager<\/span>)<\/span> sender<\/span>()<\/span> {<\/span>\r\n    ...<\/span>\r\n              case<\/span> m<\/span>.<\/span>syncCh<\/span> <-<\/span> m<\/span>.<\/span>allGroups<\/span>()<\/span>:<\/span> \/\/ allGroups()\u3067 targetgroups\u3092 syncCh \u30c1\u30e3\u30f3\u30cd\u30eb\u306b\u9001\u4fe1<\/span>\r\n    ...<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                            \u5728 `sender()` \u51fd\u6570\u4e2d\uff0c\u5411\u4fe1\u9053\u53d1\u9001 `m.allGroups()`\u3002\u5f53\u67e5\u770b `SyncCh()` \u51fd\u6570\u65f6\uff0c\u53ef\u4ee5\u5982\u9884\u671f\u5730\u770b\u5230\u5b83\u4ee5\u53ea\u8bfb\u65b9\u5f0f\u8fd4\u56de `m.syncCh`\u3002<\/p>\n
                            \/\/ SyncCh returns a read only channel used by all the clients to receive target updates.<\/span>\r\nfunc<\/span> (<\/span>m<\/span> *<\/span>Manager<\/span>)<\/span> SyncCh<\/span>()<\/span> <-<\/span>chan<\/span> map<\/span>[<\/span>string<\/span>][]<\/span>*<\/span>targetgroup<\/span>.<\/span>Group<\/span> {<\/span>\r\n    return<\/span> m<\/span>.<\/span>syncCh<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                            \u6211\u53d1\u73b0 DiscoveryManager\u4e00\u76f4\u5728\u66f4\u65b0\u4eceScrapeConfig\u8f6c\u6362\u800c\u6765\u7684TargetGroups\uff0c\u5e76\u901a\u8fc7\u901a\u9053\u5c06\u5176\u6301\u7eed\u4f20\u9012\u7ed9ScrapeManager\uff01<\/p>\n
                            \u6211\u7406\u89e3\u4e86\u8fd9\u6bb5\u4ee3\u7801https:\/\/github.com\/prometheus\/prometheus\/blob\/f5655c47e8d88220fab4c0a034ab480d4bbd537b\/scrape\/manager.go#L121-L122\u4e2dScrape Manager\u7684\u8bf4\u660e\u7684\u542b\u4e49\u3002<\/p>\n
                            \/\/ Manager maintains a set of scrape pools and manages start\/stop cycles<\/span>\r\n\/\/ when receiving new target groups from the discovery manager.<\/span>\r\n<\/code><\/pre>\n
                            \u8fd9\u8fb9\u662f\u8fdb\u5165Run\u6a21\u5757\u7684\u5730\u65b9\u3002<\/p>\n
                            func<\/span> (<\/span>m<\/span> *<\/span>Manager<\/span>)<\/span> Run<\/span>(<\/span>tsets<\/span> <-<\/span>chan<\/span> map<\/span>[<\/span>string<\/span>][]<\/span>*<\/span>targetgroup<\/span>.<\/span>Group<\/span>)<\/span> error<\/span> {<\/span>\r\n    go<\/span> m<\/span>.<\/span>reloader<\/span>()<\/span>\r\n    for<\/span> {<\/span>\r\n        select<\/span> {<\/span>\r\n        case<\/span> ts<\/span> :=<\/span> <-<\/span>tsets<\/span>:<\/span>\r\n            m<\/span>.<\/span>updateTsets<\/span>(<\/span>ts<\/span>)<\/span>\r\n\r\n            select<\/span> {<\/span>\r\n            case<\/span> m<\/span>.<\/span>triggerReload<\/span> <-<\/span> struct<\/span>{}{}<\/span>:<\/span>\r\n            default<\/span>:<\/span>\r\n            }<\/span>\r\n\r\n        case<\/span> <-<\/span>m<\/span>.<\/span>graceShut<\/span>:<\/span>\r\n            return<\/span> nil<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                              \n
                            1. \n
                                \u5728\u8c03\u7528reloader()\u51fd\u6570\u4e4b\u540e\uff0c<\/ol>\n<\/li>\n<\/ol>\n
                                 <\/p>\n
                                  \n
                                1. \n
                                    \u5bf9\u4e8e\u4f7f\u7528for\u5faa\u73af\u904d\u5386\u53c2\u6570tsets\u8868\u793a\u7684\u901a\u9053\u6765\u8bf4\uff0c\u5982\u679c\u6709\u65b0\u7684\u6d88\u606f\u5230\u6765\uff0c<\/ol>\n<\/li>\n<\/ol>\n
                                     <\/p>\n
                                      \n
                                    1. \n
                                        \u90a3\u4e48\u5148\u901a\u8fc7m.updateTsets(ts)\u6765\u66f4\u65b0\u76ee\u6807\u96c6\u5408\uff0c<\/ol>\n<\/li>\n<\/ol>\n
                                         <\/p>\n
                                          \u7136\u540e\u518d\u5411m.triggerReload\u901a\u9053\u53d1\u9001\u6d88\u606f\uff08\u5728reloader\u4e2d\u4e5f\u4f1a\u51fa\u73b0\uff09\u3002<\/ol>\n
                                          \u7531\u4e8eRun\u6b63\u5728\u9605\u8bfbreloader\uff0c\u6240\u4ee5\u4e0b\u4e00\u4e2areloader\u662f<\/p>\n
                                          func<\/span> (<\/span>m<\/span> *<\/span>Manager<\/span>)<\/span> reloader<\/span>()<\/span> {<\/span>\r\n    ticker<\/span> :=<\/span> time<\/span>.<\/span>NewTicker<\/span>(<\/span>5<\/span> *<\/span> time<\/span>.<\/span>Second<\/span>)<\/span>\r\n    defer<\/span> ticker<\/span>.<\/span>Stop<\/span>()<\/span>\r\n\r\n    for<\/span> {<\/span>\r\n        select<\/span> {<\/span>\r\n        case<\/span> <-<\/span>m<\/span>.<\/span>graceShut<\/span>:<\/span>\r\n            return<\/span>\r\n        case<\/span> <-<\/span>ticker<\/span>.<\/span>C<\/span>:<\/span>\r\n            select<\/span> {<\/span>\r\n            case<\/span> <-<\/span>m<\/span>.<\/span>triggerReload<\/span>:<\/span>\r\n                m<\/span>.<\/span>reload<\/span>()<\/span>\r\n            case<\/span> <-<\/span>m<\/span>.<\/span>graceShut<\/span>:<\/span>\r\n                return<\/span>\r\n            }<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                                          \u6bcf\u96945\u79d2\u68c0\u67e5m.triggerReload\u662f\u5426\u5b58\u5728\uff0c\u5982\u679c\u5b58\u5728\u5219\u8c03\u7528reload()\u51fd\u6570\u3002<\/p>\n
                                          func<\/span> (<\/span>m<\/span> *<\/span>Manager<\/span>)<\/span> reload<\/span>()<\/span> {<\/span>\r\n    m<\/span>.<\/span>mtxScrape<\/span>.<\/span>Lock<\/span>()<\/span>\r\n    var<\/span> wg<\/span> sync<\/span>.<\/span>WaitGroup<\/span>\r\n    for<\/span> setName<\/span>,<\/span> groups<\/span> :=<\/span> range<\/span> m<\/span>.<\/span>targetSets<\/span> {<\/span>\r\n        if<\/span> _<\/span>,<\/span> ok<\/span> :=<\/span> m<\/span>.<\/span>scrapePools<\/span>[<\/span>setName<\/span>];<\/span> !<\/span>ok<\/span> {<\/span>\r\n            scrapeConfig<\/span>,<\/span> ok<\/span> :=<\/span> m<\/span>.<\/span>scrapeConfigs<\/span>[<\/span>setName<\/span>]<\/span>\r\n            if<\/span> !<\/span>ok<\/span> {<\/span>\r\n                level<\/span>.<\/span>Error<\/span>(<\/span>m<\/span>.<\/span>logger<\/span>)<\/span>.<\/span>Log<\/span>(<\/span>\"msg\"<\/span>,<\/span> \"error reloading target set\"<\/span>,<\/span> \"err\"<\/span>,<\/span> \"invalid config id:\"<\/span>+<\/span>setName<\/span>)<\/span>\r\n                continue<\/span>\r\n            }<\/span>\r\n            sp<\/span>,<\/span> err<\/span> :=<\/span> newScrapePool<\/span>(<\/span>scrapeConfig<\/span>,<\/span> m<\/span>.<\/span>append<\/span>,<\/span> m<\/span>.<\/span>jitterSeed<\/span>,<\/span> log<\/span>.<\/span>With<\/span>(<\/span>m<\/span>.<\/span>logger<\/span>,<\/span> \"scrape_pool\"<\/span>,<\/span> setName<\/span>))<\/span>\r\n            if<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n                level<\/span>.<\/span>Error<\/span>(<\/span>m<\/span>.<\/span>logger<\/span>)<\/span>.<\/span>Log<\/span>(<\/span>\"msg\"<\/span>,<\/span> \"error creating new scrape pool\"<\/span>,<\/span> \"err\"<\/span>,<\/span> err<\/span>,<\/span> \"scrape_pool\"<\/span>,<\/span> setName<\/span>)<\/span>\r\n                continue<\/span>\r\n            }<\/span>\r\n            m<\/span>.<\/span>scrapePools<\/span>[<\/span>setName<\/span>]<\/span> =<\/span> sp<\/span>\r\n        }<\/span>\r\n\r\n        wg<\/span>.<\/span>Add<\/span>(<\/span>1<\/span>)<\/span>\r\n        \/\/ Run the sync in parallel as these take a while and at high load can't catch up.<\/span>\r\n        go<\/span> func<\/span>(<\/span>sp<\/span> *<\/span>scrapePool<\/span>,<\/span> groups<\/span> []<\/span>*<\/span>targetgroup<\/span>.<\/span>Group<\/span>)<\/span> {<\/span>\r\n            sp<\/span>.<\/span>Sync<\/span>(<\/span>groups<\/span>)<\/span>\r\n            wg<\/span>.<\/span>Done<\/span>()<\/span>\r\n        }(<\/span>m<\/span>.<\/span>scrapePools<\/span>[<\/span>setName<\/span>],<\/span> groups<\/span>)<\/span>\r\n\r\n    }<\/span>\r\n    m<\/span>.<\/span>mtxScrape<\/span>.<\/span>Unlock<\/span>()<\/span>\r\n    wg<\/span>.<\/span>Wait<\/span>()<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                                            \n
                                          1. \n
                                              \u5982\u679c\u5728m.targetSets\u76ee\u6807\u96c6\u4e0a\u6ca1\u6709\u68c0\u67e5\u4e0escrapePools\u5bf9\u5e94\u7684\u5185\u5bb9\uff0c\u5219\u5728newScrapePool\u4e2d\u521b\u5efascrape pool\uff0c\u5e76\u5c06\u5176\u5b58\u50a8\u5728m.scrapePool\u4e2d<\/ol>\n<\/li>\n<\/ol>\n
                                               <\/p>\n
                                                \u5bf9\u4e8eScrapePool\u8fdb\u884c\u4e0e\u76ee\u6807\u7ec4\u7684\u540c\u6b65\u64cd\u4f5c<\/ol>\n
                                                ScrapePool\u5177\u6709\u4ee5\u4e0b\u7c7b\u578b\uff0c\u5176\u4e2dloops\u662f\u4e00\u4e2ascrapeLoop\u6570\u7ec4\uff0cstorage.Appendable\u7528\u4e8e\u4fdd\u5b58\u5df2\u7ecf\u722c\u53d6\u7684\u5185\u5bb9\u3002activeTargets\u4fdd\u6301\u6700\u65b0\u72b6\u6001\u4ee5\u8fdb\u884cScrape\u64cd\u4f5c\u7684\u76ee\u6807\u3002<\/p>\n
                                                \/\/ scrapePool manages scrapes for sets of targets.<\/span>\r\ntype<\/span> scrapePool<\/span> struct<\/span> {<\/span>\r\n    appendable<\/span> storage<\/span>.<\/span>Appendable<\/span>\r\n    logger<\/span>     log<\/span>.<\/span>Logger<\/span>\r\n    cancel<\/span>     context<\/span>.<\/span>CancelFunc<\/span>\r\n\r\n    \/\/ mtx must not be taken after targetMtx.<\/span>\r\n    mtx<\/span>            sync<\/span>.<\/span>Mutex<\/span>\r\n    config<\/span>         *<\/span>config<\/span>.<\/span>ScrapeConfig<\/span>\r\n    client<\/span>         *<\/span>http<\/span>.<\/span>Client<\/span>\r\n    loops<\/span>          map<\/span>[<\/span>uint64<\/span>]<\/span>loop<\/span>\r\n    targetLimitHit<\/span> bool<\/span> \/\/ Internal state to speed up the target_limit checks.<\/span>\r\n\r\n    targetMtx<\/span> sync<\/span>.<\/span>Mutex<\/span>\r\n    \/\/ activeTargets and loops must always be synchronized to have the same<\/span>\r\n    \/\/ set of hashes.<\/span>\r\n    activeTargets<\/span>  map<\/span>[<\/span>uint64<\/span>]<\/span>*<\/span>Target<\/span>\r\n    droppedTargets<\/span> []<\/span>*<\/span>Target<\/span>\r\n\r\n    \/\/ Constructor for new scrape loops. This is settable for testing convenience.<\/span>\r\n    newLoop<\/span> func<\/span>(<\/span>scrapeLoopOptions<\/span>)<\/span> loop<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                                                \u5728Sync()\u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528targetsFromGroup\u6765\u83b7\u53d6\u5217\u8868\u7684\u76ee\u6807\u7ec4\uff0c\u5e76\u8c03\u7528sp.sync(all)\u6765\u53ea\u540c\u6b65\u8fd9\u4e9b\u76ee\u6807\u7ec4\u4e2d\u7684\u8d44\u6e90\u3002<\/p>\n
                                                \/\/ Sync converts target groups into actual scrape targets and synchronizes<\/span>\r\n\/\/ the currently running scraper with the resulting set and returns all scraped and dropped targets.<\/span>\r\nfunc<\/span> (<\/span>sp<\/span> *<\/span>scrapePool<\/span>)<\/span> Sync<\/span>(<\/span>tgs<\/span> []<\/span>*<\/span>targetgroup<\/span>.<\/span>Group<\/span>)<\/span> {<\/span>\r\n    sp<\/span>.<\/span>mtx<\/span>.<\/span>Lock<\/span>()<\/span>\r\n    defer<\/span> sp<\/span>.<\/span>mtx<\/span>.<\/span>Unlock<\/span>()<\/span>\r\n    start<\/span> :=<\/span> time<\/span>.<\/span>Now<\/span>()<\/span>\r\n\r\n    sp<\/span>.<\/span>targetMtx<\/span>.<\/span>Lock<\/span>()<\/span>\r\n    var<\/span> all<\/span> []<\/span>*<\/span>Target<\/span>\r\n    sp<\/span>.<\/span>droppedTargets<\/span> =<\/span> []<\/span>*<\/span>Target<\/span>{}<\/span>\r\n    for<\/span> _<\/span>,<\/span> tg<\/span> :=<\/span> range<\/span> tgs<\/span> {<\/span>\r\n        targets<\/span>,<\/span> failures<\/span> :=<\/span> targetsFromGroup<\/span>(<\/span>tg<\/span>,<\/span> sp<\/span>.<\/span>config<\/span>)<\/span>\r\n        for<\/span> _<\/span>,<\/span> err<\/span> :=<\/span> range<\/span> failures<\/span> {<\/span>\r\n            level<\/span>.<\/span>Error<\/span>(<\/span>sp<\/span>.<\/span>logger<\/span>)<\/span>.<\/span>Log<\/span>(<\/span>\"msg\"<\/span>,<\/span> \"Creating target failed\"<\/span>,<\/span> \"err\"<\/span>,<\/span> err<\/span>)<\/span>\r\n        }<\/span>\r\n        targetSyncFailed<\/span>.<\/span>WithLabelValues<\/span>(<\/span>sp<\/span>.<\/span>config<\/span>.<\/span>JobName<\/span>)<\/span>.<\/span>Add<\/span>(<\/span>float64<\/span>(<\/span>len<\/span>(<\/span>failures<\/span>)))<\/span>\r\n        for<\/span> _<\/span>,<\/span> t<\/span> :=<\/span> range<\/span> targets<\/span> {<\/span>\r\n            if<\/span> t<\/span>.<\/span>Labels<\/span>()<\/span>.<\/span>Len<\/span>()<\/span> ><\/span> 0<\/span> {<\/span>\r\n                all<\/span> =<\/span> append<\/span>(<\/span>all<\/span>,<\/span> t<\/span>)<\/span>\r\n            }<\/span> else<\/span> if<\/span> t<\/span>.<\/span>DiscoveredLabels<\/span>()<\/span>.<\/span>Len<\/span>()<\/span> ><\/span> 0<\/span> {<\/span>\r\n                sp<\/span>.<\/span>droppedTargets<\/span> =<\/span> append<\/span>(<\/span>sp<\/span>.<\/span>droppedTargets<\/span>,<\/span> t<\/span>)<\/span>\r\n            }<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n    sp<\/span>.<\/span>targetMtx<\/span>.<\/span>Unlock<\/span>()<\/span>\r\n    sp<\/span>.<\/span>sync<\/span>(<\/span>all<\/span>)<\/span>\r\n\r\n    targetSyncIntervalLength<\/span>.<\/span>WithLabelValues<\/span>(<\/span>sp<\/span>.<\/span>config<\/span>.<\/span>JobName<\/span>)<\/span>.<\/span>Observe<\/span>(<\/span>\r\n        time<\/span>.<\/span>Since<\/span>(<\/span>start<\/span>)<\/span>.<\/span>Seconds<\/span>(),<\/span>\r\n    )<\/span>\r\n    targetScrapePoolSyncsCounter<\/span>.<\/span>WithLabelValues<\/span>(<\/span>sp<\/span>.<\/span>config<\/span>.<\/span>JobName<\/span>)<\/span>.<\/span>Inc<\/span>()<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                                                \u5728 sync(targets) \u4e2d\uff0c\u66f4\u65b0\u4f20\u5165\u7684 targets \u7684 activeTargets \u548c loops\u3002\u5982\u679c\u76ee\u6807\u4e0d\u5728 activeTargets \u4e2d\uff0c\u5219\u521b\u5efa targetScraper \u5e76\u8fdb\u884c\u66f4\u65b0\u3002\u540c\u65f6\uff0c\u5220\u9664\u91cd\u590d\u7684\u76ee\u6807\u3002\u6700\u540e\uff0c\u8c03\u7528 loop \u7684 run()\u3002<\/p>\n
                                                func<\/span> (<\/span>sp<\/span> *<\/span>scrapePool<\/span>)<\/span> sync<\/span>(<\/span>targets<\/span> []<\/span>*<\/span>Target<\/span>)<\/span> {<\/span>\r\n    var<\/span> (<\/span>\r\n        uniqueLoops<\/span>   =<\/span> make<\/span>(<\/span>map<\/span>[<\/span>uint64<\/span>]<\/span>loop<\/span>)<\/span>\r\n        interval<\/span>      =<\/span> time<\/span>.<\/span>Duration<\/span>(<\/span>sp<\/span>.<\/span>config<\/span>.<\/span>ScrapeInterval<\/span>)<\/span>\r\n        timeout<\/span>       =<\/span> time<\/span>.<\/span>Duration<\/span>(<\/span>sp<\/span>.<\/span>config<\/span>.<\/span>ScrapeTimeout<\/span>)<\/span>\r\n        bodySizeLimit<\/span> =<\/span> int64<\/span>(<\/span>sp<\/span>.<\/span>config<\/span>.<\/span>BodySizeLimit<\/span>)<\/span>\r\n        sampleLimit<\/span>   =<\/span> int<\/span>(<\/span>sp<\/span>.<\/span>config<\/span>.<\/span>SampleLimit<\/span>)<\/span>\r\n        labelLimits<\/span>   =<\/span> &<\/span>labelLimits<\/span>{<\/span>\r\n            labelLimit<\/span>:<\/span>            int<\/span>(<\/span>sp<\/span>.<\/span>config<\/span>.<\/span>LabelLimit<\/span>),<\/span>\r\n            labelNameLengthLimit<\/span>:<\/span>  int<\/span>(<\/span>sp<\/span>.<\/span>config<\/span>.<\/span>LabelNameLengthLimit<\/span>),<\/span>\r\n            labelValueLengthLimit<\/span>:<\/span> int<\/span>(<\/span>sp<\/span>.<\/span>config<\/span>.<\/span>LabelValueLengthLimit<\/span>),<\/span>\r\n        }<\/span>\r\n        honorLabels<\/span>     =<\/span> sp<\/span>.<\/span>config<\/span>.<\/span>HonorLabels<\/span>\r\n        honorTimestamps<\/span> =<\/span> sp<\/span>.<\/span>config<\/span>.<\/span>HonorTimestamps<\/span>\r\n        mrc<\/span>             =<\/span> sp<\/span>.<\/span>config<\/span>.<\/span>MetricRelabelConfigs<\/span>\r\n    )<\/span>\r\n\r\n    sp<\/span>.<\/span>targetMtx<\/span>.<\/span>Lock<\/span>()<\/span>\r\n    for<\/span> _<\/span>,<\/span> t<\/span> :=<\/span> range<\/span> targets<\/span> {<\/span>\r\n        hash<\/span> :=<\/span> t<\/span>.<\/span>hash<\/span>()<\/span>\r\n\r\n        if<\/span> _<\/span>,<\/span> ok<\/span> :=<\/span> sp<\/span>.<\/span>activeTargets<\/span>[<\/span>hash<\/span>];<\/span> !<\/span>ok<\/span> {<\/span>\r\n            s<\/span> :=<\/span> &<\/span>targetScraper<\/span>{<\/span>Target<\/span>:<\/span> t<\/span>,<\/span> client<\/span>:<\/span> sp<\/span>.<\/span>client<\/span>,<\/span> timeout<\/span>:<\/span> timeout<\/span>,<\/span> bodySizeLimit<\/span>:<\/span> bodySizeLimit<\/span>}<\/span>\r\n            l<\/span> :=<\/span> sp<\/span>.<\/span>newLoop<\/span>(<\/span>scrapeLoopOptions<\/span>{<\/span>\r\n                target<\/span>:<\/span>          t<\/span>,<\/span>\r\n                scraper<\/span>:<\/span>         s<\/span>,<\/span>\r\n                sampleLimit<\/span>:<\/span>     sampleLimit<\/span>,<\/span>\r\n                labelLimits<\/span>:<\/span>     labelLimits<\/span>,<\/span>\r\n                honorLabels<\/span>:<\/span>     honorLabels<\/span>,<\/span>\r\n                honorTimestamps<\/span>:<\/span> honorTimestamps<\/span>,<\/span>\r\n                mrc<\/span>:<\/span>             mrc<\/span>,<\/span>\r\n            })<\/span>\r\n\r\n            sp<\/span>.<\/span>activeTargets<\/span>[<\/span>hash<\/span>]<\/span> =<\/span> t<\/span>\r\n            sp<\/span>.<\/span>loops<\/span>[<\/span>hash<\/span>]<\/span> =<\/span> l<\/span>\r\n\r\n            uniqueLoops<\/span>[<\/span>hash<\/span>]<\/span> =<\/span> l<\/span>\r\n        }<\/span> else<\/span> {<\/span>\r\n            \/\/ This might be a duplicated target.<\/span>\r\n            if<\/span> _<\/span>,<\/span> ok<\/span> :=<\/span> uniqueLoops<\/span>[<\/span>hash<\/span>];<\/span> !<\/span>ok<\/span> {<\/span>\r\n                uniqueLoops<\/span>[<\/span>hash<\/span>]<\/span> =<\/span> nil<\/span>\r\n            }<\/span>\r\n            \/\/ Need to keep the most updated labels information<\/span>\r\n            \/\/ for displaying it in the Service Discovery web page.<\/span>\r\n            sp<\/span>.<\/span>activeTargets<\/span>[<\/span>hash<\/span>]<\/span>.<\/span>SetDiscoveredLabels<\/span>(<\/span>t<\/span>.<\/span>DiscoveredLabels<\/span>())<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n    var<\/span> wg<\/span> sync<\/span>.<\/span>WaitGroup<\/span>\r\n\r\n    \/\/ Stop and remove old targets and scraper loops.<\/span>\r\n    for<\/span> hash<\/span> :=<\/span> range<\/span> sp<\/span>.<\/span>activeTargets<\/span> {<\/span>\r\n        if<\/span> _<\/span>,<\/span> ok<\/span> :=<\/span> uniqueLoops<\/span>[<\/span>hash<\/span>];<\/span> !<\/span>ok<\/span> {<\/span>\r\n            wg<\/span>.<\/span>Add<\/span>(<\/span>1<\/span>)<\/span>\r\n            go<\/span> func<\/span>(<\/span>l<\/span> loop<\/span>)<\/span> {<\/span>\r\n                l<\/span>.<\/span>stop<\/span>()<\/span>\r\n                wg<\/span>.<\/span>Done<\/span>()<\/span>\r\n            }(<\/span>sp<\/span>.<\/span>loops<\/span>[<\/span>hash<\/span>])<\/span>\r\n\r\n            delete<\/span>(<\/span>sp<\/span>.<\/span>loops<\/span>,<\/span> hash<\/span>)<\/span>\r\n            delete<\/span>(<\/span>sp<\/span>.<\/span>activeTargets<\/span>,<\/span> hash<\/span>)<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n    sp<\/span>.<\/span>targetMtx<\/span>.<\/span>Unlock<\/span>()<\/span>\r\n\r\n    targetScrapePoolTargetsAdded<\/span>.<\/span>WithLabelValues<\/span>(<\/span>sp<\/span>.<\/span>config<\/span>.<\/span>JobName<\/span>)<\/span>.<\/span>Set<\/span>(<\/span>float64<\/span>(<\/span>len<\/span>(<\/span>uniqueLoops<\/span>)))<\/span>\r\n    forcedErr<\/span> :=<\/span> sp<\/span>.<\/span>refreshTargetLimitErr<\/span>()<\/span>\r\n    for<\/span> _<\/span>,<\/span> l<\/span> :=<\/span> range<\/span> sp<\/span>.<\/span>loops<\/span> {<\/span>\r\n        l<\/span>.<\/span>setForcedError<\/span>(<\/span>forcedErr<\/span>)<\/span>\r\n    }<\/span>\r\n    for<\/span> _<\/span>,<\/span> l<\/span> :=<\/span> range<\/span> uniqueLoops<\/span> {<\/span>\r\n        if<\/span> l<\/span> !=<\/span> nil<\/span> {<\/span>\r\n            go<\/span> l<\/span>.<\/span>run<\/span>(<\/span>interval<\/span>,<\/span> timeout<\/span>,<\/span> nil<\/span>)<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n    \/\/ Wait for all potentially stopped scrapers to terminate.<\/span>\r\n    \/\/ This covers the case of flapping targets. If the server is under high load, a new scraper<\/span>\r\n    \/\/ may be active and tries to insert. The old scraper that didn't terminate yet could still<\/span>\r\n    \/\/ be inserting a previous sample set.<\/span>\r\n    wg<\/span>.<\/span>Wait<\/span>()<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
                                                \u5728loop.run()\u51fd\u6570\u4e2d\uff0c\u8c03\u7528\u4e86scrapeAndReport()\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u53c8\u8c03\u7528\u4e86scrape()\u3001appender()\u548creport()\u51fd\u6570\u3002\u5728\u53d1\u9001HTTP\u8bf7\u6c42\u4ee5\u83b7\u53d6\u6307\u6807\u540e\uff0c\u5e94\u8be5\u4f1a\u8fdb\u884c\u4fdd\u5b58\u64cd\u4f5c\uff08\u4e0escrape\u3001appender\u548creport\u51fd\u6570\u7684\u5177\u4f53\u7ec6\u8282\u65e0\u5173\uff09\u3002<\/p>\n
                                                \"prometheus-scrape-manager.png\"<\/div>\n
                                                \u603b\u7ed3<\/h1>\n
                                                1. \u5728Prometheus\u7684\u4e3b\u51fd\u6570\u4e2d\uff0c\u5927\u81f4\u6d41\u7a0b\u662f\u4ec0\u4e48\uff1f
                                                \n2. DiscoveryManager\u548cScrapeManager\u7684\u5927\u81f4\u6d41\u7a0b\u662f\u4ec0\u4e48\uff1f
                                                \n3. \u4fe1\u606f\u662f\u5982\u4f55\u4eceDiscoveryManager\u4f20\u9012\u5230ScrapeManager\u7684\uff1f<\/p>\n
                                                \u6211\u80fd\u591f\u770b\u5230<\/p>\n
                                                \u4e0b\u6b21\uff0c\u8ba1\u5212\u5bf9Storage\u73af\u5883\u548cNotificationManager\u8fdb\u884c\u5168\u9762\u4ecb\u7ecd\uff0c\u4ee5\u4fbf\u53ef\u4ee5\u5168\u9762\u4e86\u89e3\u6574\u4f53\u60c5\u51b5\u3002<\/p>\n
                                                \u5176\u4ed6\u65b9\u9762\u7684\u611f\u60f3\u662f\uff0c\u5982\u4f55\u6709\u6548\u5730\u63cf\u7ed8\u5185\u90e8\u903b\u8f91\u662f\u56f0\u96be\u7684\u3002<\/p>\n
                                                \u94fe\u63a5<\/h1>\n
                                                \u672c\u6b21\u76ee\u6807\u4ee3\u7801\uff1a
                                                \n– Prometheus\u7684main.go\uff1ahttps:\/\/github.com\/prometheus\/prometheus\/blob\/main\/cmd\/prometheus\/main.go
                                                \n– DiscoverManager\uff1ahttps:\/\/github.com\/prometheus\/prometheus\/blob\/main\/discovery\/manager.go
                                                \n– ScrapeManager\uff1ahttps:\/\/github.com\/prometheus\/prometheus\/blob\/main\/scrape\/manager.go<\/p>\n","protected":false},"excerpt":{"rendered":"
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