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diff --git a/toolkit/components/backgroundtasks/metrics.yaml b/toolkit/components/backgroundtasks/metrics.yaml
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+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Adding a new metric? We have docs for that!
+# https://firefox-source-docs.mozilla.org/toolkit/components/glean/user/new_definitions_file.html
+
+---
+$schema: moz://mozilla.org/schemas/glean/metrics/2-0-0
+$tags:
+  - 'Toolkit :: Background Tasks'
+
+# Use the `rmdir` YAML reference when you want to get your own metrics id for
+# BackgroundTask_removeDirectory.
+# Do not use this base metrics directly.
+background_tasks.rmdir.base: &rmdir
+  metric_base: &metric_base
+    expires: never
+    send_in_pings:
+      - background-tasks
+    bugs:
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=1788986
+    data_reviews:
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=1788986
+    notification_emails:
+      - krosylight@mozilla.com
+      - vgosu@mozilla.com
+    # Override below. These exist solely to workaround validation issues.
+    type: event
+    description: The base metric template for removeDirectory.
+  elapsed_ms:
+    <<: *metric_base
+    type: quantity
+    unit: milliseconds
+    description: >
+      The amount of time the task took for removing the directories.
+  was_first:
+    <<: *metric_base
+    type: boolean
+    description: >
+      Whether this task is the first one removing the directory.
+  retry_count:
+    <<: *metric_base
+    type: quantity
+    unit: files
+    description: >
+      The number of retries before the task started removing the child
+      directory. This can happen when the target directory doesn't exist.
+  removal_count:
+    <<: *metric_base
+    type: quantity
+    unit: files
+    description: >
+      The number of the removed entries at each call, even if the target
+      directory itself couldn't be removed.
+  succeeded:
+    <<: *metric_base
+    type: boolean
+    description: Whether the target directory removal succeeded.
+  suffix_removal_count:
+    <<: *metric_base
+    type: quantity
+    unit: files
+    description: >
+      The number of the removed entries of the suffixed directories.
+  suffix_ever_failed:
+    <<: *metric_base
+    type: boolean
+    description: Whether removing the suffixed directories ever failed.
+
+# Metrics identifiers for each use
+background_tasks.rmdir.quota:
+  <<: *rmdir
+background_tasks.rmdir.http_cache:
+  <<: *rmdir