Bug 1852098 - mach command gen-use-counter-metrics r=emilio,firefox-b…

…uild-system-reviewers,ahochheiden

Takes use counter definitions and generates a use_counter_metrics.yaml with
`counter` metric definitions for each use counter and denominator.

Total use counters at time of writing: 2271 (excludes denominators)

Differential Revision: https://phabricator.services.mozilla.com/D193246

dom/base/mach_commands.py

@@ -0,0 +1,21 @@
+# 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/.
+
+from mach.decorators import Command
+
+
+@Command(
+    "gen-use-counter-metrics",
+    category="misc",
+    description="Generate a Glean use_counter_metrics.yaml file, creating metrics definitions for every use counter.",
+)
+def gen_use_counter_metrics(command_context):
+    # Dispatch to usecounters.py
+    import sys
+    from os import path
+
+    sys.path.append(path.dirname(__file__))
+    from usecounters import gen_use_counter_metrics
+
+    return gen_use_counter_metrics()