**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**

<!-- Is there currently another issue associated with this? -->

tis = tis.filter(TI.task_id.in_(self.dag.task_ids))
        return tis.all()
    @provide_session
    def get_task_instance(
        self,
        task_id: str,
        session: Session = NEW_SESSION,
        *,
        map_index: int = -1,
    ) -> TI | None:
        """
        Returns the task instance specified by task_id for this dag run
        :param task_id: the task id
        :param session: Sqlalchemy ORM Session
        """
        return (
            session.query(TI)
            .filter_by(dag_id=self.dag_id, run_id=self.run_id, task_id=task_id, map_index=map_index)
            .one_or_none()
        )
    def get_dag(self) -> DAG:
        """
        Returns the Dag associated with this DagRun.
        :return: DAG
        """
        if not self.dag:
            raise AirflowException(f"The DAG (.dag) for {self} needs to be set")
        return self.dag
    @provide_session
    def get_previous_dagrun(