tree a35df7bd71481b107f157b209761c538a00b86b1
parent ab26ebb83385aede74b14ff4ef1872b741b06fb1
author Thomas Draebing <thomas.draebing@sap.com> 1584960793 +0100
committer Thomas Draebing <thomas.draebing@sap.com> 1584960793 +0100

Remove custom labels added to logs during parsing

Promtail was configured to create labels for nearly every key in the
logs. This was done to support easier label-based querying. Loki
however is not optimized to  work with labels having a high cardinality.
This led to failures in Loki, if it had to handle a high number of
logs. In addition, the high number of labels led to a huge number of
chunks being created, mostly just containing a single log entry,
making querying and storage very inefficient.

This change removes all custom made labels, except for the
gerrit_version label. Logs should rather be queried using the grep-
like syntax of LogQL for which Loki is optimized.

Change-Id: I70e2a3ff4f640bc6f5d08d50212958a7bca2eae1