9.0 test plan

[inge4pres]

Manual Test Plan

List of changes: v8.18.0...v9.0.0 (both tags are not there yet)

Smoke Testing ESS setup

Thanks to #8303 further smoke tests are run automatically on ESS now.
Consider extending the smoke tests to include more test cases which we'd like to cover

go-docappender library

No changes, same dependency version used

apm-data library

No changes, same dependency version used

Test cases from the GitHub board

Add yourself as assignee on the PR before you start testing.

apm-server 9.0.0 test-plan

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Tasks

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1. feat: drop fleet agentcfg and direct fetcher #14921
   backport-skip test-plan test-plan-ok +3
   
2. feat: use xxhash for error grouping key #15211
   backport-skip test-plan-ok +2
   
3. TBS: change default disk usage threshold to 0.8 #15524
   backport-9.0 +1
   
4. TBS: Replace badger with pebble #15235
   backport-8.x +1
5. upgrade testing from 8.18 to 9.0 in various settings (with TBS enabled, apm-server standalone vs. fleet managed, etc)
6. feat: start hiding beats monitoring behind otel abstraction #15360
   backport-8.x test-plan test-plan-ok v8.19.0 +4
   
7. Translate otel metrics to libbeat monitoring #15094
   backport-8.x test-plan test-plan-ok +3
   

Regressions

[endorama]

I tested #15094 (and related #15360).

Test scenario:

• created a new deployment with 9.0.0-beta1 in Cloud
• enabled Logs and Metrics collection to the same deployment
• run apmsoak with apm-server scenario
• checked Stack Monitoring UI
• checked .monitoring-beats-8-mb data stream

Stack monitoring was displaying APM metrics and beats_stats.metrics.apm-server.* fields where visible in the monitoring data stream

Pictures

[inge4pres]

tested #15211 with otelgen, adding a RecordError() call to all spans