Cannot send custom statsd metrics in a plugin

### Under which category would you file this issue? Airflow Core ### Apache Airflow version 3.2.1 ### What happened and how to reproduce it? A while back, I was using a plugin to send custom statsd metrics after a fail or success dag run : ``` from airflow.stats import Stats metric_success = f"brs_dag_last_5_runs_states.success.{dag_id}" metric_failed = f"brs_dag_last_5_runs_states.failed.{dag_id}" Stats.gauge(metric_success, success_count) Stats.gauge(metric_failed, failed_count) ``` And it was working fine. But, it's not working anymore : no metric is sent to my statsd_exporter. Here is my configuration : ``` AIRFLOW__METRICS__STATSD_HOST: 10.2.218.29 AIRFLOW__METRICS__STATSD_INFLUXDB_ENABLED: 'True' AIRFLOW__METRICS__STATSD_ON: 'True' AIRFLOW__METRICS__STATSD_PORT: '9125' AIRFLOW__METRICS__STATSD_PREFIX: prod ``` Please note : I don't have any issue with the "native" statsd metrics from Airflow : my stats_exporter is collecting them. After some debug of the statsd object inside my plugin file : ``` log.info("Stats object: %r", Stats) for attr in ("_instance", "_logger", "factory"): log.info("Stats.%s = %r", attr, getattr(Stats, attr, None)) ``` ``` 2026-06-30T09:03:49.079501Z [info ] Stats object: <class 'airflow.sdk._shared.observability.metrics.stats.Stats'> [airflow.utils.log.logging_mixin.LoggingMixin] loc=brs_tools.py:90 2026-06-30T09:03:49.079666Z [info ] Stats._instance = None [airflow.utils.log.logging_mixin.LoggingMixin] loc=brs_tools.py:92 2026-06-30T09:03:49.079812Z [info ] Stats._logger = None [airflow.utils.log.logging_mixin.LoggingMixin] loc=brs_tools.py:92 2026-06-30T09:03:49.079946Z [info ] Stats.factory = <class 'airflow.sdk._shared.observability.metrics.base_stats_logger.NoStatsLogger'> [airflow.utils.log.logging_mixin.LoggingMixin] loc=brs_tools.py:92 2026-06-30T09:03:49.080074Z [info ] Stats.gauge returned: None [airflow.utils.log.logging_mixin.L…