rel: prep for release of 1.21 (#668)

Documenting release 1.21.

---------

Co-authored-by: Kent Quirk <kentquirk@honeycomb.io>

CHANGELOG.md

@@ -1,5 +1,39 @@
 # Refinery Changelog
 
+## 1.21.0 2023-04-14
+
+### Summary
+Adds many fixes for existing features such as meta fields for use with stress relief mode. Adds ability to annotate sample rates that 
+were already set upstream before refinery sampling for debugging purposes. 
+
+### Enhancements
+- feat: annotate incoming sample rate (#658) | [Faith Chikwekwe](https://github.com/fchikwekwe)
+
+### Bug Fixes
+- fix: Replace incorrectly used Systemd Alias directive with a WantedBy (#657) | [Irving Popovetsky](https://github.com/IrvingPopovetsky)
+- fix: add hostname to span during stress relief mode (#666) | [Faith Chikwekwe](https://github.com/fchikwekwe)
+- fix: only decorate late spans when configured to do so (#665) | [Faith Chikwekwe](https://github.com/fchikwekwe)
+- fix: validate cache overrun strategy for stress relief mode (#664) | [Faith Chikwekwe](https://github.com/fchikwekwe)
+- docs: update doc to remove deprecated field name (#659) | [Faith Chikwekwe](https://github.com/fchikwekwe)
+- fix: Remove Stop() function from stress relief (#645) | [Kent Quirk](https://github.com/kentquirk)
+- chore: Spelling (#644) | [Josh Soref](https://github.com/JoshSoref)
+- fix: tweak timeouts (#647) | [Faith Chikwekwe](https://github.com/fchikwekwe)
+- fix: correct syntax error in config_complete.toml (#639) | [Hazel Weakly](https://github.com/HazelWeakly)
+
+### Maintenance 
+- chore: Update MetricsReportingInterval in config_complete.toml (#653) | [Davin](https://github.com/Davin)
+- maint: switch dependabot to collection (#660) | [Vera Reynolds](https://github.com/Vera Reynolds)
+- maint(deps): bump google.golang.org/protobuf from 1.28.1 to 1.30.0 (#663) | [dependabot[bot]](https://github.com/dependabot[bot])
+- maint(deps): bump github.com/honeycombio/husky from 0.21.0 to 0.22.2 (#662) | [dependabot[bot]](https://github.com/dependabot[bot])
+- maint(deps): bump github.com/klauspost/compress from 1.16.3 to 1.16.4 (#661) | [dependabot[bot]](https://github.com/dependabot[bot])
+- maint(deps): bump go.uber.org/automaxprocs from 1.5.1 to 1.5.2 (#650) | [dependabot[bot]](https://github.com/dependabot[bot])
+- maint(deps): bump github.com/honeycombio/dynsampler-go from 0.3.0 to 0.4.0 (#649) | [dependabot[bot]](https://github.com/dependabot[bot])
+- maint(deps): bump google.golang.org/grpc from 1.52.3 to 1.54.0 (#652) | [dependabot[bot]](https://github.com/dependabot[bot])
+- maint(deps): bump github.com/honeycombio/husky from 0.21.0 to 0.22.2 (#651) | [dependabot[bot]](https://github.com/dependabot[bot])
+- maint(deps): bump github.com/klauspost/compress from 1.16.0 to 1.16.3 (#648) | [dependabot[bot]](https://github.com/dependabot[bot])
+- maint: Add labels to docker image (#640) | [Tyler Helmuth](https://github.com/TylerHelmuth)
+- maint: Add LICENSES dir (#638) | [Tyler Helmuth](https://github.com/TylerHelmuth)
+
 ## 1.20.0 2023-03-10
 
 ### Summary

RELEASE_NOTES.md

@@ -2,6 +2,24 @@
 
 While [CHANGELOG.md](./CHANGELOG.md) contains detailed documentation and links to all of the source code changes in a given release, this document is intended to be aimed at a more comprehensible version of the contents of the release from the point of view of users of Refinery.
 
+## Version 1.21.0
+
+This is a small release with mostly bug fixes and minor changes related to Stress Relief Mode. 
+
+### Fixes for Stress Relief 
+
+This update includes many small changes geared at making Stress Relief Mode work better. 
+- Hostname is now annotated when Stress Relief is active. 
+- Stress Relief Mode can now only be activated when CacheOverrunStrategy is set to "impact" since it is not compatible with "legacy".
+- The `Stop()` function was removed from Stress Relief Mode; it wasn't needed and was causing confusing errors. 
+
+### General Bug Fixes 
+
+There were other small changes to other parts of refinery. 
+- Systemd `Alias=` directive was replaced with `WantedBy=` directive which is more in line with best practices. 
+- Late spans are now only decorated when `AddRuleReasonToTrace` is set. 
+- Some potential fixes for flaky tests were added. 
+
 ## Version 1.20.0
 
 This is a significant new release of Refinery, with several features designed to help when operating Refinery at scale:

RELEASING.md

@@ -1,8 +1,9 @@
 # Release Process
 
 1. Add release entry to [changelog](./CHANGELOG.md)
-2. Open a PR with the above, and merge that into main
-3. Create new tag on merged commit with the new version (e.g. `v1.4.1`)
-4. Push the tag upstream (this will kick off the release pipeline in CI)
-5. Copy change log entry for newest version into draft GitHub release created as part of CI publish steps
-6. Update the `appVersion` and any relevant chart changes in [helm-charts](https://github.com/honeycombio/helm-charts/tree/main/charts/refinery)
+2. Add a summary of release changes to [release notes](./RELEASE_NOTES.md)
+3. Open a PR with the above, and merge that into main
+4. Create new tag on merged commit with the new version (e.g. `v1.4.1`)
+5. Push the tag upstream (this will kick off the release pipeline in CI)
+6. Copy change log entry for newest version into draft GitHub release created as part of CI publish steps
+7. Update the `appVersion` and any relevant chart changes in [helm-charts](https://github.com/honeycombio/helm-charts/tree/main/charts/refinery)