This release changes the default for GOGC, the Go runtime control for the trade-off between excess memory use and CPU usage. We have found that Prometheus operates with minimal additional CPU usage, but greatly reduced memory by adjusting the upstream Go default from 100 to 50.
## 2.53.0 / 2024-06-16
* [CHANGE] Rules: Execute 1 query instead of N (where N is the number of alerts within alert rule) when restoring alerts. #13980
* [CHANGE] Runtime: Change GOGC threshold from 100 to 50 #14176
* [FEATURE] Rules: Add new option `query_offset` for each rule group via rule group configuration file and `rule_query_offset` as part of the global configuration to have more resilience for remote write delays. #14061
* [ENHANCEMENT] Rules: Add `rule_group_last_restore_duration_seconds` to measure the time it takes to restore a rule group. #13974
This release changes the default for GOGC, the Go runtime control for the trade-off between excess memory use and CPU usage. We have found that Prometheus operates with minimal additional CPU usage, but greatly reduced memory by adjusting the upstream Go default from 100 to 75.
* [CHANGE] Rules: Execute 1 query instead of N (where N is the number of alerts within alert rule) when restoring alerts. #13980#14048
* [CHANGE] Runtime: Change GOGC threshold from 100 to 75 #14176#14285
* [FEATURE] Rules: Add new option `query_offset` for each rule group via rule group configuration file and `rule_query_offset` as part of the global configuration to have more resilience for remote write delays. #14061#14216#14273
* [ENHANCEMENT] Rules: Add `rule_group_last_restore_duration_seconds` metric to measure the time it takes to restore a rule group. #13974
* [ENHANCEMENT] OTLP: Improve remote write format translation performance by using label set hashes for metric identifiers instead of string based ones. #14006#13991
* [ENHANCEMENT] TSDB: Optimize querying with regexp matchers. #13620
* [BUGFIX] OTLP: Don't generate target_info unless at least one identifying label is defined. #13991
* [BUGFIX] OTLP: Don't generate target_info unless there are metrics. #13991
* [BUGFIX] OTLP: Don't generate target_info unless there are metrics and at least one identifying label is defined. #13991
* [BUGFIX] Scrape: Do no try to ingest native histograms when the native histograms feature is turned off. This happened when protobuf scrape was enabled by for example the created time feature. #13987
* [BUGFIX] Scaleway SD: Use the instance's public IP if no private IP is available as the `__address__` meta label. #13941
* [BUGFIX] Query logger: Do not leak file descriptors on error. #13948
* [BUGFIX] TSDB: Let queries with heavy regex matches be cancelled and not use up the CPU. #14096#14103#14118#14199
* [BUGFIX] API: Do not warn if result count is equal to the limit, only when exceeding the limit for the series, label-names and label-values APIs. #14116
* [BUGFIX] TSDB: Fix head stats and hooks when replaying a corrupted snapshot. #14079
@ -149,6 +149,8 @@ Changes for a patch release or release candidate should be merged into the previ
Bump the version in the `VERSION` file and update `CHANGELOG.md`. Do this in a proper PR pointing to the release branch as this gives others the opportunity to chime in on the release in general and on the addition to the changelog in particular. For a release candidate, append something like `-rc.0` to the version (with the corresponding changes to the tag name, the release name etc.).
When updating the `CHANGELOG.md` look at all PRs included in the release since the last release and verify if they need a changelog entry.
Note that `CHANGELOG.md` should only document changes relevant to users of Prometheus, including external API changes, performance improvements, and new features. Do not document changes of internal interfaces, code refactorings and clean-ups, changes to the build process, etc. People interested in these are asked to refer to the git history.
For release candidates still update `CHANGELOG.md`, but when you cut the final release later, merge all the changes from the pre-releases into the one final update.
George Krajcsovits
5 months ago
committed by