changes to merge PA-RTF

[atharvasharma61]

Implementation and extension of Issue: #585

Code changes w.r.t. merging PA with Open Telemetry

Changes:

1. Framework changes to leverage otel functionality in PA.
2. Added RTF collectors which now publish same metrics in opentelemetry format as well.
3. Added support to control RTF Collectors and existing RCA collectors dynamically at runtime at cluster level through API calls.

Dependent Changes:
Commons-repo -> opensearch-project/performance-analyzer-commons#74

/*

 0 -> Only RCA collectors enabled - CollectorMode: RCA
1 -> Only Telemetry collectors enabled -  CollectorMode: OTEL
2 -> Both RCA and Telemetry Collectors Enabled - CollectorMode: DUAL

*/

curl localhost:9200/_opendistro/_performanceanalyzer/cluster/config -H 'Content-Type: application/json' -d '{"collectorsSetting": 0}'

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Additional context

Check List

• Backport Labels added.
• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[atharvasharma61]

https://pastecode.io/s/9bksb3ak
Heap metrics

[ansjcy]

Hi @atharvasharma61! This looks like an interesting change, do we have any rfc/doc to provide more context?

[atharvasharma61]

One more thing to call-out: We need to enable delta temporality in Opensearch Otel. @Gaganjuneja

[Gaganjuneja]

Please take a look at build failures.

[atharvasharma61]

Please take a look at build failures.

Dependent on PRs: #657 and opensearch-project/performance-analyzer-commons#74

[nishchay21]

please add java doc on all collectors

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-2.x 2.x
# Navigate to the new working tree
cd .worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-651-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 17611035b0519b96de809da2ccb07ea9b4107ede
# Push it to GitHub
git push --set-upstream origin backport/backport-651-to-2.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-651-to-2.x.