This patch introduces vmagent support inside tenant-level monitoring
stacks, ensuring that all tenant workloads have consistent and reliable
metrics scraping. By deploying a vmagent per tenant and wiring it to the
configured VictoriaMetrics short- and long-term storage, metrics are now
properly collected, labeled, and remote-written. This resolves gaps
where tenant environments previously missed metrics due to the absence
of dedicated agents.
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## What this PR does
### Release note
```release-note
[monitoring,platform] Add vmagent integration into tenant monitoring
stacks to ensure complete and correct metrics collection for all tenants.
```
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added VictoriaMetrics Agent (Vmagent) support in monitoring:
configurable external labels and remote-write endpoints for metric
collection.
* **Documentation**
* Added README documentation for the new Vmagent configuration options
and example defaults.
<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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