lib/instana/backend/host_agent.rb in instana-1.209.2 vs lib/instana/backend/host_agent.rb in instana-1.209.3

@@ -50,12 +50,18 @@
           e: discovery_value['pid'],
           h: discovery_value['agentUuid']
         }.reject { |_, v| v.nil? }
       end
 
-      # @return [Array] extra headers to include in the trace
+      # @return [Array] extra headers to capture with HTTP spans
       def extra_headers
-        discovery_value['extraHeaders']
+        if discovery_value['tracing']
+          # Starting with discovery version 1.6.4, this value is in tracing.extra-http-headers.
+          discovery_value['tracing']['extra-http-headers']
+        else
+          # Legacy fallback for discovery versions <= 1.6.3.
+          discovery_value['extraHeaders']
+        end
       end
 
       # @return [Hash] values which are removed from urls sent to the backend
       def secret_values
         discovery_value['secrets']