Marco Costa

Follows up from #2282. This PR ensures the `TraceOperation#sampling_mechanism` populated in #2282 is injected and extracted during distributed tracing. This happens through the `_dd.p.dm` tag: e.g. `sampling_mechanism=1` becomes `_dd.p.dm=-1` The...

Solves #1252 We currently report the globally configured `Rails.configuration.cache_store` as the cache backend tag (`rails.cache.backend`) regardless if the instrumented ActiveSupport cache object is actually the global `cache_store`. This causes applications...

**Is your feature request related to a problem? Please describe.** With the introduction of [Quantize Sidekiq arguments](https://github.com/DataDog/dd-trace-rb/pull/1972), [it was pointed out by @agrobbin that](https://github.com/DataDog/dd-trace-rb/pull/1972#issuecomment-1179645325) some background job gems that integrate...

### Caveats * Error does not propagate all the way to the root span: this means this request is not considered an error span, thus not displayed in aggregated trace...

Should gems include private methods and constants in their RBS files?

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For Ruby gems, is it good practice to include all API (public, protected, and private) in their RBS files, or should they only include the publicly accessible API? I work...

**2.0 Upgrade Guide notes** Add the `http.status_code` tag to the Grape `grape.endpoint_run` span for cases where the request did not raise an exception. For cases where an exception was raised,...

2.0

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This draft PR is created to allow tracking the changes towards 2.0. **2.0 Upgrade Guide notes** **What does this PR do?** **Motivation:** **Additional Notes:** **How to test the change?** **For...

**2.0 Upgrade Guide notes** **What does this PR do?** **Motivation:** **Additional Notes:** **How to test the change?** **For Datadog employees:** - [ ] If this PR touches code that signs...

Include forked tests in coverage report

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(I'm trying to see if code coverage for Sidekiq fork tests like https://app.codecov.io/gh/DataDog/dd-trace-rb/blob/master/spec%2Fdatadog%2Ftracing%2Fcontrib%2Fsidekiq%2Fserver_internal_tracer%2Fjob_fetch_spec.rb#L26 start being collected)

**What does this PR do?** When `Datadog.configure` tries to instrument a gem but that gem is not loaded it currently gives up. With this PR, it now registers a hook...