Attach request ID as tracing metadata (#5456)

* Propagate the trace context to event triggers

* Handle missing trace and span IDs

* Store trace context as one LOCAL

* Add migrations

* Documentation

* Include the request ID as trace metadata

* changelog

* Fix warnings

* Respond to code review suggestions

* Respond to code review

* Undo changelog

* Update CHANGELOG.md

* Typo

Co-authored-by: Vamshi Surabhi <0x777@users.noreply.github.com>

server/src-lib/Hasura/Server/App.hs

@@ -275,9 +275,13 @@ mkSpockAction serverCtx qErrEncoder qErrModifier apiHandler = do
           tracingCtx
           (fromString (B8.unpack pathInfo))
 
-    requestId <- getRequestId headers
-
+    requestId <- getRequestId headers    
+    
     mapActionT runTraceT $ do
+      -- Add the request ID to the tracing metadata so that we
+      -- can correlate requests and traces
+      lift $ Tracing.attachMetadata [("request_id", unRequestId requestId)]
+
       userInfoE <- fmap fst <$> lift (resolveUserInfo logger manager headers authMode)
       userInfo  <- either (logErrorAndResp Nothing requestId req (Left reqBody) False headers . qErrModifier)
                   return userInfoE