Fix OpenTelemetry internal loading

lib/datadog/opentelemetry.rb

@@ -8,7 +8,10 @@
 # This file activates the integrations of all OpenTelemetry
 # components supported by Datadog.
 
+# Load Tracing
 require_relative 'tracing'
+require_relative 'tracing/contrib'
+
 require_relative 'opentelemetry/api/context'
 
 # DEV: Should this be a Contrib integration, that depends on the `opentelemetry-sdk`

lib/datadog/opentelemetry/sdk/propagator.rb

@@ -29,9 +29,10 @@ def extract(
           carrier, context: ::OpenTelemetry::Context.current,
           getter: ::OpenTelemetry::Context::Propagation.text_map_getter
         )
-          unless getter == ::OpenTelemetry::Context::Propagation.text_map_getter
+          if getter != ::OpenTelemetry::Context::Propagation.text_map_getter &&
+              getter != ::OpenTelemetry::Common::Propagation.rack_env_getter
             Datadog.logger.error(
-              'Custom getter is not supported. Please inform the `ddtrace` team at ' \
+              "Custom getter #{getter} is not supported. Please inform the `ddtrace` team at " \
             ' https://github.com/DataDog/dd-trace-rb of your use case so we can best support you. Using the default ' \
             'OpenTelemetry::Context::Propagation.text_map_getter as a fallback getter.'
             )

lib/datadog/tracing/contrib/http/distributed/fetcher.rb

@@ -13,8 +13,8 @@ module Distributed
           #
           # In case both variants are present, the verbatim match will be used.
           class Fetcher < Tracing::Distributed::Fetcher
-            # DEV: Should we try to parse both verbatim an Rack-formatted headers,
-            # DEV: given Rack-formatted is the most common format in Ruby?
+            # @param [String] name the header name
+            # @return [String, nil] the header value or nil if not found
             def [](name)
               # Try to fetch with the plain key
               value = super(name)

sig/datadog/tracing/contrib/http/distributed/fetcher.rbs

@@ -4,7 +4,7 @@ module Datadog
       module HTTP
         module Distributed
           class Fetcher < Tracing::Distributed::Fetcher
-            def []: (untyped name) -> untyped
+            def []: (String name) -> (String | nil)
           end
         end
       end