Bug 1706616 - Part 1: Add telemetry probe for query stripping. r=dimi,necko-reviewers,dragana

Differential Revision: https://phabricator.services.mozilla.com/D117006

docshell/base/nsDocShellLoadState.cpp

@@ -21,6 +21,7 @@
 #include "mozilla/dom/LoadURIOptionsBinding.h"
 #include "mozilla/StaticPrefs_browser.h"
 #include "mozilla/StaticPrefs_fission.h"
+#include "mozilla/Telemetry.h"
 #include "mozilla/URLQueryStringStripper.h"
 
 #include "mozilla/OriginAttributes.h"
@@ -601,10 +602,16 @@ void nsDocShellLoadState::MaybeStripTrackerQueryStrings(
     return;
   }
 
+  Telemetry::AccumulateCategorical(
+      Telemetry::LABELS_QUERY_STRIPPING_COUNT::Navigation);
+
   nsCOMPtr<nsIURI> strippedURI;
   if (URLQueryStringStripper::Strip(URI(), strippedURI)) {
     mUnstrippedURI = URI();
     SetURI(strippedURI);
+
+    Telemetry::AccumulateCategorical(
+        Telemetry::LABELS_QUERY_STRIPPING_COUNT::StripForNavigation);
   } else if (LoadType() & nsIDocShell::LOAD_CMD_RELOAD) {
     // Preserve the Unstripped URI if it's a reload. By doing this, we can
     // restore the stripped query parameters once the ETP has been toggled to