Use all installed resource detectors by default & remove `OTEL_EXPERIMENTAL_RESOURCE_DETECTORS` env var

[bschoenmaeckers]

Is your feature request related to a problem?

Currently we rely on the environment variable OTEL_EXPERIMENTAL_RESOURCE_DETECTORS to enable resource detectors. This unfortunately requires manual listing all installed resource detectors that are installed to enable them. Which does not have the usability comfort of other auto-instrumentation components.

Describe the solution you'd like

I would love to see that all detectors are enabled by default when installed like the instrumentation libraries.

Describe alternatives you've considered

setting OTEL(_EXPERIMENTAL)_RESOURCE_DETECTORS to all

An alternative option is to allow setting the env var to the value all. On which all resource detectors will be loaded.

Additional Context

No response

Would you like to implement a fix?

Yes

Tip

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[xrmx]

The plan was to move all the attributes to the default OTELResourceDetector as they are marked stable. In the meantime I think all may be a good workaround. Let's see if anyone has opinions.

[tammy-baylis-swi]

What about * instead of all to be consistent with OTEL_PYTHON_DISABLED_INSTRUMENTATIONS? (https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3967)

[bschoenmaeckers]

What about * instead of all to be consistent with OTEL_PYTHON_DISABLED_INSTRUMENTATIONS? (open-telemetry/opentelemetry-python-contrib#3967)

* Sound fine by me. Does someone else have a preference?