expose node counts for enterpise analytics

[pratik50]

Exposes the existing active and inactive ingestor and querier counts through a reusable helper.

This allows Enterprise analytics to reuse the current cluster liveness logic when exporting node metrics.

Summary by CodeRabbit

• New Features

  • Cluster analytics now report active and inactive counts for ingestors and queriers.
  • Prometheus metrics expose separate active and inactive node counts by node type, enabling monitoring of both ingestors and queriers.

• Bug Fixes

  • Querier active and inactive counts now use the same node-count reporting as the cluster analytics.

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Reviewing files that changed from the base of the PR and between 84d4e6a and b63698d.

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• src/analytics.rs
• src/metrics/mod.rs

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Walkthrough

The change adds Prometheus gauges for active and inactive ingestors and queriers. Helpers count nodes by liveness and update the gauges. Report::new() uses the helper for querier counts.

Changes

Cluster node counts

Layer / File(s)	Summary
Define and register node count metrics src/metrics/mod.rs	Integer gauge vectors track active and inactive node counts by node type. The custom Prometheus registry registers both gauges.
Add liveness-based count helpers src/analytics.rs, src/metrics/mod.rs	fetch_node_counts() retrieves metadata and counts nodes by liveness. fetch_cluster_node_counts() updates gauges for both node types and caps counts at i64::MAX. Report::new() uses fetch_node_counts() for querier counts.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Feature

Suggested reviewers: parmesant

Merge Risk: ⚪ Minimal · up to b6369

No actionable merge-blocking issue remains. The node counts are available through the public helper for Enterprise analytics.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the goal and main change, but it does not follow the repository template. It omits the Description heading, solution rationale, key-change details, and all required checklist …	Update the description to use the repository template. Add the solution and rationale, describe the key changes, and complete the testing, comments, and documentation checklist items. Correct the title spelling if needed: "Expose node count…
Docstring Coverage	⚠️ Warning	Docstring coverage is 14.29% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: exposing node counts for Enterprise analytics. It contains a minor spelling error in "enterpise," but the meaning remains clear.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description explains the goal and main change, but it does not follow the repository template. It omits the Description heading, solution rationale, key-change details, and all required checklist items for testing, comments, and documentation.

Resolution

Update the description to use the repository template. Add the solution and rationale, describe the key changes, and complete the testing, comments, and documentation checklist items. Correct the title spelling if needed: "Expose node counts for Enterprise analytics."

• Fix all pre-merge checks with AI

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create a new PR

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_{A rabbit counts the nodes at night,
The gauges hold their numbers right.
Ingestors hop, and queriers too,
Their liveness tells the count to view.
Prometheus records the trail,
While rabbits nibble greens without fail.}

_{Comment @coderabbitai help to get the list of available commands.}

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Actionable comments posted: 1

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Inline comments:
In `@src/analytics.rs`:
- Line 182: Update fetch_cluster_node_counts to count ingestors using liveness
only, rather than calling fetch_ingestors_metrics; add a helper that retrieves
ingestor metadata and counts each node as active or inactive via check_liveness.
Keep analytics collection in Report::new() unchanged.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Essentials

Run ID: eb33e0d0-73a5-410f-aacb-69b151419492

📥 Commits

Reviewing files that changed from the base of the PR and between c756fc9 and 101b9bb.

📒 Files selected for processing (1)

• src/analytics.rs

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