Bug 1823678 - Integrate Server Knobs into Fenix

app/.experimenter.yaml

@@ -15,6 +15,14 @@ cookie-banners:
     sections-enabled:
       type: json
       description: This property provides a lookup table of whether or not the given section should be enabled.
+glean:
+  description: A feature that provides server-side configurations for Glean metrics (aka Server Knobs).
+  hasExposure: true
+  exposureDescription: ""
+  variables:
+    metrics-enabled:
+      type: json
+      description: "A map of metric base-identifiers to booleans representing the state of the 'enabled' flag for that metric."
 growth-data:
   description: A feature measuring campaign growth data
   hasExposure: true

app/nimbus.fml.yaml

@@ -316,6 +316,14 @@ features:
         type: List<OnboardingPanel>
         default: ["themes", "toolbar-placement", "sync", "tcp", "privacy-notice"]
 
+  glean:
+    description: "A feature that provides server-side configurations for Glean metrics (aka Server Knobs)."
+    variables:
+      metrics-enabled:
+        description: "A map of metric base-identifiers to booleans representing the state of the 'enabled' flag for that metric."
+        type: Map<String, Boolean>
+        default: {}
+
 types:
   objects: {}
 

app/src/main/java/org/mozilla/fenix/FenixApplication.kt

@@ -197,6 +197,9 @@ open class FenixApplication : LocaleAwareApplication(), Provider {
             buildInfo = GleanBuildInfo.buildInfo,
         )
 
+        // Set the metric configuration from Nimbus.
+        Glean.setMetricsEnabledConfig(FxNimbus.features.glean.value().metricsEnabled)
+
         // We avoid blocking the main thread on startup by setting startup metrics on the background thread.
         val store = components.core.store
         GlobalScope.launch(Dispatchers.IO) {