Bug 1689987 - P5: Add probes to collect DNS lookup time when ODoH is used r=necko-reviewers,valentin

Differential Revision: https://phabricator.services.mozilla.com/D105215

netwerk/base/nsLoadGroup.cpp

@@ -968,6 +968,23 @@ void nsLoadGroup::TelemetryReportChannel(nsITimedChannel* aTimedChannel,
     }
   }
 
+  if (StaticPrefs::network_trr_odoh_enabled() && !domainLookupStart.IsNull() &&
+      !domainLookupEnd.IsNull()) {
+    nsCOMPtr<nsIDNSService> dns = do_GetService(NS_DNSSERVICE_CONTRACTID);
+    bool ODoHActivated = false;
+    if (dns && NS_SUCCEEDED(dns->GetODoHActivated(&ODoHActivated)) &&
+        ODoHActivated) {
+      if (aDefaultRequest) {
+        Telemetry::AccumulateTimeDelta(
+            Telemetry::HTTP_PAGE_DNS_ODOH_LOOKUP_TIME, domainLookupStart,
+            domainLookupEnd);
+      } else {
+        Telemetry::AccumulateTimeDelta(Telemetry::HTTP_SUB_DNS_ODOH_LOOKUP_TIME,
+                                       domainLookupStart, domainLookupEnd);
+      }
+    }
+  }
+
 #undef HTTP_REQUEST_HISTOGRAMS
 }
 

toolkit/components/telemetry/Histograms.json

@@ -16468,5 +16468,27 @@
     "bug_numbers": [1689987],
     "releaseChannelCollection": "opt-out",
     "description": "When in ODoH-first mode, it lists the reason we may have skipped ODoH"
+  },
+  "HTTP_PAGE_DNS_ODOH_LOOKUP_TIME": {
+    "record_in_processes": ["main", "content"],
+    "products": ["firefox"],
+    "expires_in_version": "never",
+    "alert_emails": ["necko@mozilla.com", "kershaw@mozilla.com"],
+    "kind": "exponential",
+    "high": 30000,
+    "n_buckets": 50,
+    "description": "HTTP page channel: ODoH lookup time (ms)",
+    "bug_numbers": [1689987]
+  },
+  "HTTP_SUB_DNS_ODOH_LOOKUP_TIME": {
+    "record_in_processes": ["main", "content"],
+    "products": ["firefox"],
+    "expires_in_version": "never",
+    "kind": "exponential",
+    "high": 30000,
+    "n_buckets": 50,
+    "bug_numbers": [1689987],
+    "alert_emails": ["necko@mozilla.com", "kershaw@mozilla.com"],
+    "description": "HTTP subitem channel: ODoH lookup time (ms)"
   }
 }