Merge branch 'pratik/otel-phase5-docs-deployment' into pratik/otel-phase6-statsd

Forward-merge the Rule D __name__ builtin fix (and prior naming-check work).

.github/scripts/otel-naming/check_otel_naming.py

@@ -699,6 +699,7 @@ def run_rule_d_dashboards(root: Path, l1_keys: Set[str], report: Report) -> None
         report.skip("D", "no L1 key set to validate against")
         return
     builtins = {
+        "__name__",  # Prometheus reserved label for the metric name itself
         "le",
         "exported_instance",
         "span_name",

.github/scripts/otel-naming/test_check_otel_naming.py

@@ -502,6 +502,14 @@ class RuleDDashboards(unittest.TestCase):
             [],
         )
 
+    def test_prometheus_name_label_not_flagged(self):
+        # `__name__` is the Prometheus reserved metric-name label; the renamed
+        # system-*.json dashboards use `sum by (le, __name__)`.
+        self.assertEqual(
+            self._run('"expr": "sum by (le, __name__) (rate(x[5m]))"', set()),
+            [],
+        )
+
     def test_l1_label_passes(self):
         self.assertEqual(self._run('"q": "{command=\\"x\\"}"', {"command"}), [])