ashb commented on code in PR #53722:
URL: https://github.com/apache/airflow/pull/53722#discussion_r2253949087


##########
airflow-core/src/airflow/jobs/scheduler_job_runner.py:
##########
@@ -2108,18 +2136,43 @@ def _emit_pool_metrics(self, session: Session = 
NEW_SESSION) -> None:
         with DebugTrace.start_span(span_name="emit_pool_metrics", 
component="SchedulerJobRunner") as span:
             pools = Pool.slots_stats(session=session)
             for pool_name, slot_stats in pools.items():
-                Stats.gauge(f"pool.open_slots.{pool_name}", slot_stats["open"])
-                Stats.gauge(f"pool.queued_slots.{pool_name}", 
slot_stats["queued"])
-                Stats.gauge(f"pool.running_slots.{pool_name}", 
slot_stats["running"])
-                Stats.gauge(f"pool.deferred_slots.{pool_name}", 
slot_stats["deferred"])
-                Stats.gauge(f"pool.scheduled_slots.{pool_name}", 
slot_stats["scheduled"])
-
-                # Same metrics with tagging
-                Stats.gauge("pool.open_slots", slot_stats["open"], 
tags={"pool_name": pool_name})
-                Stats.gauge("pool.queued_slots", slot_stats["queued"], 
tags={"pool_name": pool_name})
-                Stats.gauge("pool.running_slots", slot_stats["running"], 
tags={"pool_name": pool_name})
-                Stats.gauge("pool.deferred_slots", slot_stats["deferred"], 
tags={"pool_name": pool_name})
-                Stats.gauge("pool.scheduled_slots", slot_stats["scheduled"], 
tags={"pool_name": pool_name})
+                # If enabled on the config, publish metrics twice,
+                # once with backward compatible name, and then with tags.
+                DualStatsManager.gauge(
+                    f"pool.open_slots.{pool_name}",
+                    "pool.open_slots",
+                    slot_stats["open"],
+                    tags={},
+                    extra_tags={"pool_name": pool_name},
+                )

Review Comment:
   Maybe then a `legacy_name` that defaults to None and is generated in that 
case? That would make most cases simpler?



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