Add steps on how to turn off tracing in graphQL

[alexus37]

I'm excited to learn about the steps needed to disable otel tracing in GraphQL.

cc @arielvalentin

[arielvalentin]

To elaborate here a bit we are missing docs on disabling or customizing instrumentation using environment variables. Right now, we only have it via configs.

https://opentelemetry.io/docs/languages/ruby/libraries/#overriding-configuration-for-specific-instrumentation-libraries

[arielvalentin]

The RubyDocs has a snippet that we should include on opentelemetry.io: https://rubydoc.info/gems/opentelemetry-instrumentation-base/0.22.3/OpenTelemetry/Instrumentation/Base

The instrumention class establishes a convention for disabling an instrumentation by environment variable and local configuration. An instrumentation disabled by environment variable will take precedence over local config. The convention for environment variable name is the library name, upcased with '::' replaced by underscores, OPENTELEMETRY shortened to OTEL_LANG, and '_ENABLED' appended. For example: OTEL_RUBY_INSTRUMENTATION_SINATRA_ENABLED = false.

@robbkidd As you have motioned may times before... we need better tooling around documentation and options!

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[xuan-cao-swi]

Would the updated doc resolve this kind issue?