Add new trace_propagation_targets configuration to set outgoing targe…

…ts for trace header propagation

sentry-ruby/lib/sentry/configuration.rb

@@ -243,6 +243,11 @@ def capture_exception_frame_locals=(value)
     # @return [Boolean]
     attr_accessor :auto_session_tracking
 
+    # Allowlist of outgoing request targets to which sentry-trace and baggage headers are attached.
+    # Default is all (/.*/)
+    # @return [Array<String, Regexp>]
+    attr_accessor :trace_propagation_targets
+
     # The instrumenter to use, :sentry or :otel
     # @return [Symbol]
     attr_reader :instrumenter
@@ -290,6 +295,8 @@ def capture_exception_frame_locals=(value)
 
     INSTRUMENTERS = [:sentry, :otel]
 
+    PROPAGATION_TARGETS_MATCH_ALL = /.*/.freeze
+
     class << self
       # Post initialization callbacks are called at the end of initialization process
       # allowing extending the configuration of sentry-ruby by multiple extensions
@@ -332,6 +339,7 @@ def initialize
       self.dsn = ENV['SENTRY_DSN']
       self.server_name = server_name_from_env
       self.instrumenter = :sentry
+      self.trace_propagation_targets = [PROPAGATION_TARGETS_MATCH_ALL]
 
       self.before_send = nil
       self.before_send_transaction = nil

sentry-ruby/lib/sentry/net/http.rb

@@ -53,6 +53,8 @@ def set_sentry_trace_header(req, sentry_span)
         return unless sentry_span
 
         client = Sentry.get_current_client
+        return unless client
+        return unless propagate_trace?(client.configuration.trace_propagation_targets)
 
         trace = client.generate_sentry_trace(sentry_span)
         req[SENTRY_TRACE_HEADER_NAME] = trace if trace
@@ -96,6 +98,10 @@ def extract_request_info(req)
 
         result
       end
+
+      def propagate_trace?(trace_propagation_targets)
+        trace_propagation_targets.any? { |target| address.match?(target) }
+      end
     end
   end
 end