fix(obs): Update observability docker compose stack

[evanofslack]

Type of Change

• New Feature
• Bug Fix
• Documentation
• Performance Improvement
• Test/CI
• Refactor
• Other: docker compose

Related Issues

#1962

Summary of Changes

Updates observability docker compose and related config files for a fully functioning setup.

Added rustfs instance in observability stack, so that it runs within the same network and "just works". All observability services (prometheus, tempo, loki, jaeger) startup without errors (had to add redpanda for tempo trace ingest).

All datasources are directly provisioned in Grafana. All datasources work in grafana. All docker volumes are used, with no file mounts. Removed all timezone env vars. Formatted markdown. Aligned on just using CMD for healthchecks (instead of some using CMD-SHELL).

Grafana dashboard auto provisioned:

All datasources auto provisioned:

Prometheus datasource working:

Loki datasource working:

Tempo datasource working:

Jaeger datasource working:

Jaeger standalone web ui working:

Checklist

• I have read and followed the CONTRIBUTING.md guidelines
• Passed make pre-commit
• Added/updated necessary tests
• Documentation updated (if needed)
• CI/CD passed (if applicable)

Impact

• Breaking change (compatibility)
• Requires doc/config/deployment update
• Other impact: