[Traefik Mesh] Fix Traefik Mesh dashboard service tag

[agarov]

What does this PR do?

Fixes the Traefik Mesh overview dashboard to use the traefik_service tag instead of the reserved service tag.

The Traefik Mesh integration renames the OpenMetrics label service to traefik_service via RENAME_LABELS in metrics.py:

RENAME_LABELS = {
    'version': 'go_version',
    'service': 'traefik_service',
}

However, the bundled dashboard still filters and groups several widgets using service, which does not match the emitted metric tag.

Motivation

When Traefik exposes metrics such as:

traefik_router_request_duration_seconds_bucket{...,service="my-service@kubernetes",...}

the Datadog Agent ingests the service label as traefik_service, so dashboard widgets using $service or by {service} do not work as expected.

Additional Notes

Also fixes a small query typo:

$routercode:3*

to:

$router,code:3*

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[buraizu]

Approving with one minor update requested for formatting consistency

Review from buraizu is dismissed. Related teams and files:

• documentation
  • traefik_mesh/assets/dashboards/traefik_mesh_overview.json