Bug 1640867 - Add new HTTP_CHANNEL_ONSTART_SUCCESS_TRR probe r=dragana,tdsmith,necko-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D77127

netwerk/dns/TRRService.h

@@ -35,7 +35,7 @@ class TRRService : public TRRServiceBase,
   TRRService();
   nsresult Init();
   nsresult Start();
-  bool Enabled(nsIRequest::TRRMode aMode);
+  bool Enabled(nsIRequest::TRRMode aMode = nsIRequest::TRR_FIRST_MODE);
   bool IsConfirmed() { return mConfirmationState == CONFIRM_OK; }
 
   bool AllowRFC1918() { return mRfc1918; }

netwerk/protocol/http/nsHttpChannel.cpp

@@ -129,6 +129,7 @@
 #include "mozilla/net/SocketProcessParent.h"
 #include "js/Conversions.h"
 #include "mozilla/dom/SecFetch.h"
+#include "mozilla/net/TRRService.h"
 
 #ifdef MOZ_TASK_TRACER
 #  include "GeckoTaskTracer.h"
@@ -7465,6 +7466,11 @@ nsHttpChannel::OnStartRequest(nsIRequest* request) {
   Telemetry::Accumulate(Telemetry::HTTP_CHANNEL_ONSTART_SUCCESS,
                         NS_SUCCEEDED(mStatus));
 
+  if (gTRRService && gTRRService->Enabled()) {
+    Telemetry::Accumulate(Telemetry::HTTP_CHANNEL_ONSTART_SUCCESS_TRR,
+                          TRRService::AutoDetectedKey(), NS_SUCCEEDED(mStatus));
+  }
+
   if (mRaceCacheWithNetwork) {
     LOG(
         ("  racingNetAndCache - mFirstResponseSource:%d fromCache:%d "

toolkit/components/telemetry/Histograms.json

@@ -3122,6 +3122,17 @@
     "releaseChannelCollection": "opt-out",
     "alert_emails": ["necko@mozilla.com", "ddamjanovic@mozilla.com"]
   },
+  "HTTP_CHANNEL_ONSTART_SUCCESS_TRR" : {
+    "record_in_processes": ["main"],
+    "products": ["firefox", "fennec", "geckoview"],
+    "expires_in_version": "never",
+    "kind": "boolean",
+    "keyed": true,
+    "description": "Successfully started HTTP channels when TRR is enabled; Keyed by TRR auto-detected",
+    "bug_numbers": [1640867],
+    "releaseChannelCollection": "opt-out",
+    "alert_emails": ["necko@mozilla.com", "vgosu@mozilla.com"]
+  },
   "HTTP_CONNECTION_ENTRY_CACHE_HIT_1" : {
     "record_in_processes": ["main", "content"],
     "products": ["firefox", "fennec", "geckoview"],