How to configure persistent storage and data retention policies in the Prometheus system.

In the Prometheus system, data loss can be prevented by configuring relevant persistent storage and data retention policies. Here are some common ways to set this up:

1. Enable persistent storage: In the configuration file of Prometheus, you can specify the path for local persistent storage by configuring the storage.local.path parameter. Storing data on a local hard drive ensures the persistence of data, meaning that even if the Prometheus service restarts or crashes, the data will not be lost.
2. Configure data retention policy: You can set the data retention policy by configuring the storage.retention parameter, which determines the time range for data retention. Based on actual needs, you can set the retention period for data, but please keep in mind that retaining data for a longer period may require more storage space, so it’s important to balance it with storage capacity and performance.
3. Backing up and restoring data: Regularly backing up data ensures that data is not lost due to unforeseen circumstances. You can use either Prometheus’ built-in snapshot feature or third-party tools for data backup and restoration operations.
4. Utilize remote storage: In addition to local persistent storage, data can also be stored in remote storage systems. By configuring remote storage parameters, data can be backed up to remote storage to ensure its safety and reliability.

In conclusion, by properly setting up persistence storage and data retention policies, we can ensure that data in the Prometheus system will not be lost, maintaining the integrity and reliability of the data.