**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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from __future__ import annotations
import collections
import datetime
import logging
import os
import shutil
from datetime import timedelta
from tempfile import mkdtemp
from typing import Deque, Generator
from unittest import mock
from unittest.mock import MagicMock, patch
import psutil
import pytest
import time_machine
from sqlalchemy import func
import airflow.example_dags
from airflow import settings