Closes #16075: Add distribution_id in telemetry startup metrics (#16821)

(cherry picked from commit ca605d8a95)

app/metrics.yaml

@@ -685,6 +685,23 @@ metrics:
     notification_emails:
       - fenix-core@mozilla.com
     expires: "2021-08-01"
+  distribution_id:
+    type: string
+    lifetime: application
+    description: |
+      A string containing the distribution identifier. This is currently used
+      to identify installs from Mozilla Online.
+    send_in_pings:
+      - metrics
+    bugs:
+      - https://github.com/mozilla-mobile/fenix/issues/16075
+    data_reviews:
+      - https://github.com/mozilla-mobile/fenix/issues/16075
+    data_sensitivity:
+      - technical
+    notification_emails:
+      - fenix-core@mozilla.com
+    expires: never
   top_sites_count:
     type: counter
     lifetime: application

app/src/main/java/org/mozilla/fenix/components/metrics/GleanMetricsService.kt

@@ -9,6 +9,7 @@ import mozilla.components.service.fxa.manager.SyncEnginesStorage
 import mozilla.components.service.glean.Glean
 import mozilla.components.service.glean.private.NoExtraKeys
 import mozilla.components.support.base.log.logger.Logger
+import org.mozilla.fenix.Config
 import org.mozilla.fenix.GleanMetrics.AboutPage
 import org.mozilla.fenix.GleanMetrics.Addons
 import org.mozilla.fenix.GleanMetrics.AppTheme
@@ -724,6 +725,14 @@ class GleanMetricsService(
             mozillaProductDetector.getMozillaBrowserDefault(context)?.also {
                 defaultMozBrowser.set(it)
             }
+
+            distributionId.set(
+                when (Config.channel.isMozillaOnline) {
+                    true -> "MozillaOnline"
+                    false -> "Mozilla"
+                }
+            )
+
             mozillaProducts.set(mozillaProductDetector.getInstalledMozillaProducts(context))
 
             adjustCampaign.set(context.settings().adjustCampaignId)

docs/metrics.md

@@ -269,6 +269,7 @@ The following metrics are added to the ping:
 | metrics.close_tab_setting |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |A string that indicates the setting for tab closing: MANUAL, ONE_DAY, ONE_WEEK, ONE_MONTH  |[1](https://github.com/mozilla-mobile/fenix/pull/15811#issuecomment-706402952)||2021-08-01 |2 |
 | 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), [2](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
 | 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), [3](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |1, 2 |
+| metrics.distribution_id |[string](https://mozilla.github.io/glean/book/user/metrics/string.html) |A string containing the distribution identifier. This is currently used to identify installs from Mozilla Online.  |[1](https://github.com/mozilla-mobile/fenix/issues/16075)||never |1 |
 | metrics.has_open_tabs |[boolean](https://mozilla.github.io/glean/book/user/metrics/boolean.html) |A boolean that indicates if the user has any open NORMAL tabs.  |[1](https://github.com/mozilla-mobile/fenix/pull/12024), [2](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
 | 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), [2](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |
 | 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), [2](https://github.com/mozilla-mobile/fenix/pull/15713#issuecomment-703972068)||2021-08-01 |2 |