Bug 1853967 - Capture telemetry for the amount of RAM a device has.

app/metrics.yaml

@@ -2539,6 +2539,28 @@ metrics:
     metadata:
       tags:
         - Experiments
+  device_total_ram:
+    type: quantity
+    lifetime: application
+    description: >
+      The total amount of memory this device in bytes, when available will be
+      MemoryInfo.advertisedMem otherwise it will be MemoryInfo.totalMem.
+      This doesn't represent memory available to the application however.
+    send_in_pings:
+      - metrics
+    bugs:
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=1853967
+    data_reviews:
+      - https://github.com/mozilla-mobile/firefox-android/pull/2620
+    data_sensitivity:
+      - technical
+    notification_emails:
+      - android-probes@mozilla.com
+    expires: never
+    unit: integer
+    metadata:
+      tags:
+        - Performance
   search_page_load_time:
     type: timing_distribution
     time_unit: millisecond

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

@@ -801,6 +801,7 @@ open class FenixApplication : LocaleAwareApplication(), Provider {
             )
 
             ramMoreThanThreshold.set(isDeviceRamAboveThreshold)
+            deviceTotalRam.set(getDeviceTotalRAM())
         }
 
         with(AndroidAutofill) {
@@ -849,12 +850,27 @@ open class FenixApplication : LocaleAwareApplication(), Provider {
         }
     }
 
-    private fun deviceRamApproxMegabytes(): Long {
+    @VisibleForTesting
+    internal fun getDeviceTotalRAM(): Long {
+        val memoryInfo = getMemoryInfo()
+        return if (SDK_INT >= Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
+            memoryInfo.advertisedMem
+        } else {
+            memoryInfo.totalMem
+        }
+    }
+
+    @VisibleForTesting
+    internal fun getMemoryInfo(): ActivityManager.MemoryInfo {
         val memoryInfo = ActivityManager.MemoryInfo()
         val activityManager = getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
         activityManager.getMemoryInfo(memoryInfo)
 
-        val deviceRamBytes = memoryInfo.totalMem
+        return memoryInfo
+    }
+
+    private fun deviceRamApproxMegabytes(): Long {
+        val deviceRamBytes = getMemoryInfo().totalMem
         return deviceRamBytes.toRoundedMegabytes()
     }
 

app/src/test/java/org/mozilla/fenix/FenixApplicationTest.kt

@@ -143,6 +143,7 @@ class FenixApplicationTest {
         every { settings.showPocketRecommendationsFeature } returns true
         every { settings.showContileFeature } returns true
         every { application.reportHomeScreenMetrics(settings) } just Runs
+        every { application.getDeviceTotalRAM() } returns 7L
         every { settings.inactiveTabsAreEnabled } returns true
         every { application.isDeviceRamAboveThreshold } returns true
 
@@ -193,6 +194,7 @@ class FenixApplicationTest {
         assertEquals(expectedAppInstallSource, Metrics.installSource.testGetValue())
         assertEquals(true, Metrics.defaultWallpaper.testGetValue())
         assertEquals(true, Metrics.ramMoreThanThreshold.testGetValue())
+        assertEquals(7L, Metrics.deviceTotalRam.testGetValue())
 
         val contextId = TopSites.contextId.testGetValue()!!.toString()