Graphite TSDB

Clean up Carbon metrics

We encountered a full disk and the following articles were more than helpful in resolving it.

First we did clean up the whisper database to get at least some space on the disk: https://sysadmin.compxtreme.ro/clean-up-whisper-database/

And then we changed the data retention period and used a tooling to apply the new data retention to the existing metrics: https://www.linkedin.com/pulse/how-resize-already-existing-whisper-files-datapoint-panneerselvam