feat: log long-lived connections acceptance (#17219)

Closes #16904

coderd/workspaceagents.go

@@ -555,6 +555,9 @@ func (api *API) workspaceAgentLogs(rw http.ResponseWriter, r *http.Request) {
 	t := time.NewTicker(recheckInterval)
 	defer t.Stop()
 
+	// Log the request immediately instead of after it completes.
+	httpmw.RequestLoggerFromContext(ctx).WriteLog(ctx, http.StatusAccepted)
+
 	go func() {
 		defer func() {
 			logger.Debug(ctx, "end log streaming loop")
@@ -928,6 +931,9 @@ func (api *API) derpMapUpdates(rw http.ResponseWriter, r *http.Request) {
 	encoder := wsjson.NewEncoder[*tailcfg.DERPMap](ws, websocket.MessageBinary)
 	defer encoder.Close(websocket.StatusGoingAway)
 
+	// Log the request immediately instead of after it completes.
+	httpmw.RequestLoggerFromContext(ctx).WriteLog(ctx, http.StatusAccepted)
+
 	go func(ctx context.Context) {
 		// TODO(mafredri): Is this too frequent? Use separate ping disconnect timeout?
 		t := time.NewTicker(api.AgentConnectionUpdateFrequency)
@@ -1315,6 +1321,9 @@ func (api *API) watchWorkspaceAgentMetadata(
 	sendTicker := time.NewTicker(sendInterval)
 	defer sendTicker.Stop()
 
+	// Log the request immediately instead of after it completes.
+	httpmw.RequestLoggerFromContext(ctx).WriteLog(ctx, http.StatusAccepted)
+
 	// Send initial metadata.
 	sendMetadata()