basic alerts for proxySQL

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📝 Summary

Adds nine Prometheus alert rules for ProxySQL. The rules detect authentication failures, SQL injection, connection limits, MySQL errors, slow queries, shunned nodes, ProxySQL restarts, and service downtime. Each alert defines severity and operational annotations.

Walkthrough

The change adds a Prometheus rules file with nine ProxySQL alerts. The alerts cover authentication errors, SQL injection, connection limits, MySQL errors, slow queries, shunned nodes, restarts, and downtime.

Changes

ProxySQL monitoring

Layer / File(s)	Summary
ProxySQL alert rules etc/kayobe/kolla/config/prometheus/proxysql.rules	Adds nine Prometheus alert rules with expressions, severity labels, and summary and description annotations. Jinja2 raw tags preserve the alert expressions.

Priority: ⬇️ Low

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

Merge Risk: 🟡 Moderate · up to a83de

ProxySQL alerts may not load due to invalid YAML, leaving the newly monitored conditions without alerts. Fix the syntax before merge.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
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…
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.

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Actionable comments posted: 2

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Reviewing files that changed from the base of the PR and between 362c4cf and a83dee5.

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• etc/kayobe/kolla/config/prometheus/proxysql.rules

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• GitHub Check: stackhpc/check
• GitHub Check: Ansible 2.20 lint with Python 3.12
• GitHub Check: Ansible 2.19 lint with Python 3.12

🔇 Additional comments (1)

etc/kayobe/kolla/config/prometheus/proxysql.rules (1)

45-45: 🎯 Functional Correctness

mysql_error_total is a ProxySQL built-in exporter metric. The standard mysqld_exporter used by the repository's mysqld scrape job does not expose this metric. The unscoped expression therefore does not combine standard MySQL exporter errors with ProxySQL errors, so a job selector is not required for this concern.

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[priteau]

This is a good start. Can you please add a release note? https://stackhpc-kayobe-config.readthedocs.io/en/stackhpc-2026.1/contributor/release-notes.html