remove PY2 references from parse iso method and add links to document…

…ation for auth_backend(s) config

airflow/datadog_checks/airflow/airflow.py

@@ -135,12 +135,8 @@ def _get_seconds_from_iso(self, iso_string):
         """
         Returns the number of seconds since the Unix epoch for a given ISO datetime string.
         """
-
         def parse_iso_string(iso_string):
-            if PY3:
-                return datetime.fromisoformat(iso_string)
-            else:
-                return datetime.strptime(iso_string, '%Y-%m-%dT%H:%M:%S.%f%z')  # Updated format
+            return datetime.fromisoformat(iso_string)
 
         dt = parse_iso_string(iso_string)
         return dt

airflow/metadata.csv

@@ -38,6 +38,8 @@ airflow.pool.running_slots,gauge,,,,Number of running slots in the pool,0,airflo
 airflow.pool.starving_tasks,gauge,,task,,Number of starving tasks in the pool,-1,airflow,pool.starving_tasks,
 airflow.dagrun.dependency_check,gauge,,millisecond,,Milliseconds taken to check DAG dependencies,-1,airflow,dagrun.dep_check,
 airflow.dag.task.duration,gauge,,millisecond,,Milliseconds taken to finish a task,-1,airflow,dag.task.duration,
+airflow.dag.task.ongoing_duration,gauge,,second,,Current duration for ongoing DAG tasks,-1,airflow,dag.task.ongoing_duration,
+airflow.dag.task.total_running,gauge,,,,Total number of running tasks,-1,airflow,dag.task.total_running,
 airflow.dag_processing.last_duration,gauge,,millisecond,,Milliseconds taken to load the given DAG file,-1,airflow,dag_proc.last_duration,
 airflow.dagrun.duration.success,gauge,,millisecond,,Milliseconds taken for a DagRun to reach success state,-1,airflow,dagrun.duration.success,
 airflow.dagrun.duration.failed,gauge,,millisecond,,Milliseconds taken for a DagRun to reach failed state,-1,airflow,dagrun.duration.failed,

airflow/tests/compose/config/airflow.cfg

@@ -556,9 +556,11 @@ enable_experimental_api = True
 # ("airflow.api.auth.backend.default" allows all requests for historic reasons)
 
 # Airflow 2.1 E2E
+# https://airflow.apache.org/docs/apache-airflow/2.1.0/administration-and-deployment/security/api.html
 auth_backend = airflow.api.auth.backend.basic_auth
 
 # Airflow 2.6+ E2E
+# https://airflow.apache.org/docs/apache-airflow/2.6.0/administration-and-deployment/security/api.html
 auth_backends = airflow.api.auth.backend.basic_auth
 
 # Used to set the maximum page limit for API requests. If limit passed as param