Fix OpenTelemetry service name

[tomMoulard]

What does this PR do?

This PR adds the service.name and service.version resource attribute to the otel exporter to Traefik's OpenTelemetry metrics and trace exporter.

It goes from:

Resource attributes:
      -> service.name: Str(unknown_service:traefik)
      -> telemetry.sdk.language: Str(go)
      -> telemetry.sdk.name: Str(opentelemetry)
      -> telemetry.sdk.version: Str(1.11.2)

To:

Resource attributes:
     -> service.name: Str(traefik) # <-- updated
     -> service.version: Str(dev) # <-- added
     -> telemetry.sdk.language: Str(go)
     -> telemetry.sdk.name: Str(opentelemetry)
     -> telemetry.sdk.version: Str(1.11.2)

This PR also fixes a small typo in the doc.

Motivation

Have a correct service.name resource for the OpenTelemetry metrics/trace exporter.

Fix #9617.

More

• Added/updated tests
• Added/updated documentation (but not for this)

Additional comments

Co-authored-by: Kevin Pollet pollet.kevin@gmail.com

[rtribotte]

LGTM 👌

[kevinpollet]

LGTM