Update Grafana dashboard path and Prometheus targets for observability

[Dimagidhp]

Purpose

Prometheus scrapes policy-engine and router, which no longer exist as services. They were merged into gateway-runtime. Policy Engine and Router metrics are never collected, and the dashboards silently stay empty. Also fixes the issue Grafana's home dashboard pointed at a directory containing no dashboards, so it opened on a blank page.

Resolves #3343

Goals

Restore Policy Engine and Router metrics, and make Grafana open on the Infrastructure Overview dashboard.

Approach

• Point the policy-engine and router scrape jobs at gateway-runtime. Job names unchanged, so existing dashboards and alerts are unaffected.
• Point GF_DASHBOARDS_DEFAULT_HOME_DASHBOARD_PATH at /etc/grafana/dashboards/, where the dashboards are mounted.

5 lines across 4 files.

Documentation

N/A — corrections to existing internal values, no documented behaviour changes.

Automation tests

N/A — configuration-only change. Verified manually: Prometheus reports the corrected scrape URLs, and Grafana's home dashboard path now resolves to an existing file.

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes
• Ran FindSecurityBugs plugin and verified report? no — no Java code in this change.
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes

Test environment

macOS (Apple Silicon), Rancher Desktop, Docker Compose v2.

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between d7474cc and db0637f.

📒 Files selected for processing (4)

• gateway/distribution/docker-compose.yaml
• gateway/docker-compose-perf.yaml
• gateway/docker-compose.yaml
• gateway/observability/prometheus/prometheus.yml

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📝 Walkthrough

Walkthrough

The gateway observability configuration now loads Grafana’s home dashboard from the mounted dashboards directory and scrapes Policy Engine and Router metrics from the gateway-runtime container.

Changes

Gateway observability

Layer / File(s)	Summary
Align Grafana dashboard paths gateway/distribution/docker-compose.yaml, gateway/docker-compose-perf.yaml, gateway/docker-compose.yaml	Grafana now uses /etc/grafana/dashboards/infrastructure-overview.json as the default home dashboard path.
Update Prometheus runtime targets gateway/observability/prometheus/prometheus.yml	Prometheus now scrapes Policy Engine on gateway-runtime:9003 and Router on gateway-runtime:9901. Existing job names remain unchanged.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to db063

This change restores observability targets and points Grafana to the mounted dashboards directory; no actionable merge-blocking risk remains after normal checks and review.

Suggested reviewers: anugayan, arshardh, ashera96

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Out of Scope Changes check	⚠️ Warning	The Grafana default home dashboard path changes are not covered by linked issue #3343, which only requires correcting Policy Engine and Router Prometheus targets.	Link a separate issue that requires the Grafana home dashboard correction, or remove the Grafana path changes from this pull request.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes both primary changes: the Grafana dashboard path update and the Prometheus target updates.
Description check	✅ Passed	The description covers the purpose, goals, approach, documentation, testing, security checks, and test environment. It omits User stories, Samples, and Related PRs, and it describes the Grafana path a…
Linked Issues check	✅ Passed	The PR satisfies issue #3343 by redirecting the policy-engine and router scrape jobs to gateway-runtime, preserving job names, and applying the configuration across local, performance, and packaged di…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…

Full details: Description check

Explanation

The description covers the purpose, goals, approach, documentation, testing, security checks, and test environment. It omits User stories, Samples, and Related PRs, and it describes the Grafana path as a directory although the implementation uses a specific JSON file.

Full details: Linked Issues check

Explanation

The PR satisfies issue #3343 by redirecting the policy-engine and router scrape jobs to gateway-runtime, preserving job names, and applying the configuration across local, performance, and packaged distribution setups.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (4 skipped: 4 unsupported.)

• Fix all pre-merge checks with AI

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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