bugfix fix nats monitoring

[klinch0]

What this PR does

Release note

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[coderabbitai[bot]]

Walkthrough

This PR upgrades the NATS Helm chart from version 1.2.1 to 1.3.13 (application version 2.10.17 to 2.11.8), adds new Grafana dashboards for JetStream and server monitoring, enables Prometheus exporter with TLS support, introduces flexible image configuration options, and adds graceful shutdown configuration.

Changes

Cohort / File(s)	Summary
Grafana Dashboards dashboards/nats/nats-jetstream.json, dashboards/nats/nats-server.json	New dashboards added to monitor NATS JetStream metrics (messages/sec, memory, storage, streams, consumers) and NATS Server metrics (CPU, memory, bytes in/out, connections, subscriptions) via Prometheus data source.
Monitoring Configuration packages/extra/monitoring/dashboards.list, hack/download-dashboards.sh	Registered two new NATS dashboards in the monitoring system and updated download script to include nats-jetstream and nats-server entries.
Helm Chart Metadata packages/system/nats/charts/nats/Chart.yaml	Updated chart version from 1.2.1 to 1.3.13 and app version from 2.10.17 to 2.11.8.
Image and Container Configuration packages/system/nats/charts/nats/values.yaml, packages/system/nats/charts/nats/templates/_helpers.tpl	Bumped container image tags (NATS 2.10.17→2.11.8-alpine, reloader 0.15.0→0.19.1, promExporter 0.15.0→0.17.3, natsBox 0.14.3→0.18.0), added digest and fullImageName fields for flexible image specification, added monitorDomain field under promExporter. Enhanced image template logic to support digest-based and full image name overrides.
Prometheus Exporter and Pod Configuration packages/system/nats/charts/nats/files/stateful-set/prom-exporter-container.yaml, packages/system/nats/charts/nats/files/stateful-set/pod-template.yaml, packages/system/nats/values.yaml	Made Prometheus exporter metrics endpoint URL dynamic with TLS support (http/https based on monitor.tls.enabled), added 60-second terminationGracePeriodSeconds for graceful shutdown, enabled promExporter and podMonitor globally.
Helm Values and Configuration packages/apps/nats/templates/nats.yaml	Removed promExporter configuration block from JetStream values.
Documentation packages/system/nats/charts/nats/README.md	Enhanced container resources guidance, expanded image version and override documentation with multiple examples, updated Prometheus operator links, improved consistency and formatting.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Areas requiring extra attention:

• Image template logic changes in _helpers.tpl — verify digest and fullImageName precedence handling
• TLS-aware Prometheus exporter endpoint construction — confirm monitorProto and monitorDomain are properly templated
• Prometheus exporter configuration changes across multiple files (enabled globally in one, removed from another) — ensure consistency and no conflicts
• Helm chart version bump implications — validate backward compatibility with values structure changes
• New dashboard JSON syntax and PromQL expressions — verify queries are correct for the monitoring setup

Poem

🐰 The NATS chart hops to 1.3, with dashboards shiny and new, Prometheus metrics dancing in TLS-protected hue, Images versioned with digest and name, graceful shutdowns ensue, Monitoring whiskers twitching at metrics both old and true! 📊✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Add monitoring for NATs' accurately summarizes the main objective of the changeset—adding comprehensive monitoring capabilities including Grafana dashboards, Prometheus configuration, and pod monitoring for the NATS system.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

• [ ] 📝 Generate docstrings

🧪 Generate unit tests (beta)

• [ ] Create PR with unit tests
• [ ] Post copyable unit tests in a comment
• [ ] Commit unit tests in branch features-nats-monitoring

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[kvaps]

@klinch0 is it related to this issue?

• https://github.com/cozystack/cozystack/issues/1354

[kvaps]

PR rebased and ready for review