Adds support for asynchronous gauge metric type

[Gaganjuneja]

Description

As part of the #10238 we have added the Metrics Framework. We need to enhance this by adding the support for Gauge type of metrics. Gauge metrics are required to capture point in time snapshot of values.

Related Issues

Resolves #12641

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Failing checks are inspected and point to the corresponding known issue(s) (See: Troubleshooting Failing Builds)
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)
• Public documentation issue/PR created

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[Gaganjuneja]

@reta, Please take a look. Thanks!

[github-actions]

❌ Gradle check result for 1c36fe4: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for 2a626bb: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

Compatibility status:

Checks if related components are compatible with change 18e0193

Incompatible components

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/flow-framework.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/opensearch-oci-object-storage.git, https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/sql.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/performance-analyzer-rca.git, https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/performance-analyzer.git]

[github-actions]

❌ Gradle check result for 4c9768b: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for 895fc00: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

✅ Gradle check result for 18e0193: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 71.40%. Comparing base (b15cb0c) to head (18e0193).
Report is 36 commits behind head on main.

Files	Patch %	Lines
...ch/telemetry/metrics/noop/NoopMetricsRegistry.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #12642      +/-   ##
============================================
- Coverage     71.42%   71.40%   -0.02%     
- Complexity    59978    60103     +125     
============================================
  Files          4985     4991       +6     
  Lines        282275   282643     +368     
  Branches      40946    40990      +44     
============================================
+ Hits         201603   201815     +212     
- Misses        63999    64112     +113     
- Partials      16673    16716      +43     

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[Gaganjuneja]

@reta, I have fixed build errors. Please take a look once and merge. Thanks!

[reta]

@reta, I have fixed build errors. Please take a look once and merge. Thanks!

@Gaganjuneja please create a documentation issue (if none exists yet), thank you

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/OpenSearch/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/OpenSearch/backport-2.x
# Create a new branch
git switch --create backport/backport-12642-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 dfa203aae1184c5a93254a636a6851491d5c4e84
# Push it to GitHub
git push --set-upstream origin backport/backport-12642-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/OpenSearch/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-12642-to-2.x.

[reta]

@Gaganjuneja could you also please send manual backport to 2.x, thank you

[Gaganjuneja]

@reta, I have fixed build errors. Please take a look once and merge. Thanks!

@Gaganjuneja please create a documentation issue (if none exists yet), thank you

Created one - opensearch-project/documentation-website#6694