Closes #11909: Metrics for recording number of recently used PWAs

app/metrics.yaml

@@ -497,6 +497,43 @@ metrics:
     notification_emails:
       - fenix-core@mozilla.com
     expires: "2020-09-01"
+  recently_used_pwa_count:
+    type: counter
+    lifetime: application
+    description: |
+      A counter that indicates how many PWAs a user has recently used.
+      Threshold for "recency" set in HomeActivity#PWA_RECENTLY_USED_THRESHOLD.
+      Currently we are not told by the OS when a PWA is removed by the user,
+      so we use the "recently used" heuristic to judge how many PWAs are still
+      active, as a proxy for "installed". This value will only be set if the
+      user has at least *one* recently used PWA. If they have 0, this metric
+      will not be sent, resulting in a null value during analysis on the
+      server-side. To disambiguate between a failed `recently_used_pwa_count`
+      metric and 0 recent PWAs, please see `has_recent_pwas`.
+    send_in_pings:
+      - metrics
+    bugs:
+      - https://github.com/mozilla-mobile/fenix/issues/11909
+    data_reviews:
+      - https://github.com/mozilla-mobile/fenix/pull/11982#pullrequestreview-437963817
+    notification_emails:
+      - fenix-core@mozilla.com
+    expires: "2020-12-01"
+  has_recent_pwas:
+    type: boolean
+    lifetime: application
+    description: |
+      A boolean that indicates if the user has recently used PWAs.
+      See recently_used_pwa_count for the actual count.
+    send_in_pings:
+      - metrics
+    bugs:
+      - https://github.com/mozilla-mobile/fenix/issues/11909
+    data_reviews:
+      - https://github.com/mozilla-mobile/fenix/pull/11982#pullrequestreview-437963817
+    notification_emails:
+      - fenix-core@mozilla.com
+    expires: "2020-12-01"
   search_count:
     type: labeled_counter
     description: |

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

@@ -8,6 +8,7 @@ import android.content.Context
 import android.content.Intent
 import android.os.Bundle
 import android.os.StrictMode
+import android.text.format.DateUtils
 import android.util.AttributeSet
 import android.view.View
 import android.view.WindowManager
@@ -27,6 +28,7 @@ import androidx.navigation.ui.NavigationUI
 import androidx.recyclerview.widget.LinearLayoutManager
 import kotlinx.android.synthetic.main.activity_home.*
 import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import mozilla.components.browser.search.SearchEngine
 import mozilla.components.browser.session.Session
@@ -50,6 +52,7 @@ import mozilla.components.support.locale.LocaleAwareAppCompatActivity
 import mozilla.components.support.utils.SafeIntent
 import mozilla.components.support.utils.toSafeIntent
 import mozilla.components.support.webextensions.WebExtensionPopupFeature
+import org.mozilla.fenix.GleanMetrics.Metrics
 import org.mozilla.fenix.browser.UriOpenedObserver
 import org.mozilla.fenix.browser.browsingmode.BrowsingMode
 import org.mozilla.fenix.browser.browsingmode.BrowsingModeManager
@@ -188,6 +191,8 @@ open class HomeActivity : LocaleAwareAppCompatActivity() {
             intent.removeExtra(START_IN_RECENTS_SCREEN)
             moveTaskToBack(true)
         }
+
+        captureSnapshotTelemetryMetrics()
     }
 
     @CallSuper
@@ -523,6 +528,23 @@ open class HomeActivity : LocaleAwareAppCompatActivity() {
         this.visualCompletenessQueue = visualCompletenessQueue
     }
 
+    private fun captureSnapshotTelemetryMetrics() = CoroutineScope(Dispatchers.IO).launch {
+        // PWA
+        val recentlyUsedPwaCount = components.core.webAppShortcutManager.recentlyUsedWebAppsCount(
+            activeThresholdMs = PWA_RECENTLY_USED_THRESHOLD
+        )
+        if (recentlyUsedPwaCount == 0) {
+            Metrics.hasRecentPwas.set(false)
+        } else {
+            Metrics.hasRecentPwas.set(true)
+            // This metric's lifecycle is set to 'application', meaning that it gets reset upon
+            // application restart. Combined with the behaviour of the metric type itself (a growing counter),
+            // it's important that this metric is only set once per application's lifetime.
+            // Otherwise, we're going to over-count.
+            Metrics.recentlyUsedPwaCount.add(recentlyUsedPwaCount)
+        }
+    }
+
     @VisibleForTesting
     internal fun isActivityColdStarted(startingIntent: Intent, activityIcicle: Bundle?): Boolean =
         // First time opening this activity in the task.
@@ -541,5 +563,9 @@ open class HomeActivity : LocaleAwareAppCompatActivity() {
         const val EXTRA_OPENED_FROM_NOTIFICATION = "notification_open"
         const val delay = 5000L
         const val START_IN_RECENTS_SCREEN = "start_in_recents_screen"
+
+        // PWA must have been used within last 30 days to be considered "recently used" for the
+        // telemetry purposes.
+        const val PWA_RECENTLY_USED_THRESHOLD = DateUtils.DAY_IN_MILLIS * 30L
     }
 }

docs/metrics.md

@@ -251,8 +251,10 @@ The following metrics are added to the ping:
 | metrics.adjust_network |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |A string containing the Adjust network ID from which the user installed Fenix. This will not send on the first session the user runs. If the install is organic, this will be empty.  |[1](https://github.com/mozilla-mobile/fenix/pull/9253)||2020-09-01 |
 | metrics.default_browser |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |Is Fenix the default browser?  |[1](https://github.com/mozilla-mobile/fenix/pull/1067#issuecomment-474598673)||2020-09-01 |
 | metrics.default_moz_browser |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |The name of the default browser on device if and only if it's a Mozilla owned product  |[1](https://github.com/mozilla-mobile/fenix/pull/1953/), [2](https://github.com/mozilla-mobile/fenix/pull/5216)||2020-09-01 |
+| metrics.has_recent_pwas |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |A boolean that indicates if the user has recently used PWAs. See recently_used_pwa_count for the actual count.  |[1](https://github.com/mozilla-mobile/fenix/pull/11982#pullrequestreview-437963817)||2020-12-01 |
 | metrics.has_top_sites |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |A boolean that indicates if the user has top sites  |[1](https://github.com/mozilla-mobile/fenix/pull/9556)||2020-09-01 |
 | metrics.mozilla_products |[string_list](https://mozilla.github.io/glean/book/user/metrics/string_list.html) |A list of all the Mozilla products installed on device. We currently scan for: Firefox, Firefox Beta, Firefox Aurora, Firefox Nightly, Firefox Fdroid, Firefox Lite, Reference Browser, Reference Browser Debug, Fenix, Focus, and Lockwise.  |[1](https://github.com/mozilla-mobile/fenix/pull/1953/), [2](https://github.com/mozilla-mobile/fenix/pull/5216)||2020-09-01 |
+| metrics.recently_used_pwa_count |[counter](https://mozilla.github.io/glean/book/user/metrics/counter.html) |A counter that indicates how many PWAs a user has recently used. Threshold for "recency" set in HomeActivity#PWA_RECENTLY_USED_THRESHOLD. Currently we are not told by the OS when a PWA is removed by the user, so we use the "recently used" heuristic to judge how many PWAs are still active, as a proxy for "installed". This value will only be set if the user has at least *one* recently used PWA. If they have 0, this metric will not be sent, resulting in a null value during analysis on the server-side. To disambiguate between a failed `recently_used_pwa_count` metric and 0 recent PWAs, please see `has_recent_pwas`.  |[1](https://github.com/mozilla-mobile/fenix/pull/11982#pullrequestreview-437963817)||2020-12-01 |
 | metrics.search_count |[labeled_counter](https://mozilla.github.io/glean/book/user/metrics/labeled_counters.html) |The labels for this counter are `<search-engine-name>.<source>`.  If the search engine is bundled with Fenix `search-engine-name` will be the name of the search engine. If it's a custom search engine (defined: https://github.com/mozilla-mobile/fenix/issues/1607) the value will be `custom`.  `source` will be: `action`, `suggestion`, `widget` or `shortcut` (depending on the source from which the search started). Also added the `other` option for the source but it should never enter on this case.  |[1](https://github.com/mozilla-mobile/fenix/pull/1677), [2](https://github.com/mozilla-mobile/fenix/pull/5216), [3](https://github.com/mozilla-mobile/fenix/pull/7310)||2020-09-01 |
 | metrics.search_widget_installed |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |Whether or not the search widget is installed  |[1](https://github.com/mozilla-mobile/fenix/pull/10958)||2020-09-01 |
 | metrics.toolbar_position |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |A string that indicates the new position of the toolbar TOP or BOTTOM  |[1](https://github.com/mozilla-mobile/fenix/pull/6608)||2020-09-01 |