**Description**


It would be great if the metrics we publish in Airflow change to include TAGs for "variable" parts of those (such as dag_id, task_id, pool name) rather than being part of the metrics.

See here: https://airflow.apache.org/docs/1.10.12/metrics.html, https://airflow.readthedocs.io/en/latest/logging-monitoring/metrics.html  - those variable parts should be tags.

We might consider to change those metrics by default in 2.0 and possibly introduce a backport in 1.10.13 to allow people to migrate.


**Use case / motivation**

Having the variable parts of the metrics makes it really difficult to aggregate the metrics. Seems that statsd python library does not support tags, but there are possible solutions by installing extensions:

https://stackoverflow.com/questions/49852654/sending-statsd-metrics-with-tags-from-python-client

**Related Issues**

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self, states: list[TaskInstanceState], session: Session
    ) -> tuple[DefaultDict[str, int], DefaultDict[tuple[str, str], int]]:
        """
        Get the concurrency maps.
        :param states: List of states to query for
        :return: A map from (dag_id, task_id) to # of task instances and
         a map from (dag_id, task_id) to # of task instances in the given state list
        """
        ti_concurrency_query: list[tuple[str, str, int]] = (
            session.query(TI.task_id, TI.dag_id, func.count("*"))
            .filter(TI.state.in_(states))
            .group_by(TI.task_id, TI.dag_id)
        ).all()
        dag_map: DefaultDict[str, int] = defaultdict(int)
        task_map: DefaultDict[tuple[str, str], int] = defaultdict(int)
        for result in ti_concurrency_query:
            task_id, dag_id, count = result
            dag_map[dag_id] += count
            task_map[(dag_id, task_id)] = count
        return dag_map, task_map
    def _executable_task_instances_to_queued(self, max_tis: int, session: Session) -> list[TI]: