EricGao888 edited a comment on issue #19286:
URL: https://github.com/apache/airflow/issues/19286#issuecomment-962999214
```
# dagrun.schedule_delay
def _update_state(dag: DAG, dag_run: DagRun):
dag_run.state = State.RUNNING
dag_run.start_date = timezone.utcnow()
if dag.timetable.periodic:
# TODO: Logically, this should be DagRunInfo.run_after, but
the
# information is not stored on a DagRun, only before the
actual
# execution on DagModel.next_dagrun_create_after. We should
add
# a field on DagRun for this instead of relying on the run
# always happening immediately after the data interval.
expected_start_date = dag.get_run_data_interval(dag_run).end
schedule_delay = dag_run.start_date - expected_start_date
Stats.timing(f'dagrun.schedule_delay.{dag.dag_id}',
schedule_delay)
# first_task_scheduling_delay
if not self.dag.timetable.periodic:
# We can't emit this metric if there is no following
schedule to calculate from!
return
ordered_tis_by_start_date = [ti for ti in finished_tis if
ti.start_date]
ordered_tis_by_start_date.sort(key=lambda ti: ti.start_date,
reverse=False)
first_start_date = ordered_tis_by_start_date[0].start_date
if first_start_date:
# TODO: Logically, this should be DagRunInfo.run_after, but
the
# information is not stored on a DagRun, only before the
actual
# execution on DagModel.next_dagrun_create_after. We should
add
# a field on DagRun for this instead of relying on the run
# always happening immediately after the data interval.
data_interval_end = dag.get_run_data_interval(self).end
true_delay = first_start_date - data_interval_end
if true_delay.total_seconds() > 0:
Stats.timing(f'dagrun.{dag.dag_id}.first_task_scheduling_delay', true_delay)
```
I think the above two code fragments copied from scheduler_job.py and
dagrun.py calculate the metics for dagrun.schedule_delay.<dag_id> and
dagrun.<dag_id>.first_task_scheduling_delay respectively. It seems if
`dag.timetable.periodic` is false, these two metrics will not be calculated and
we cannot achieve the delay for these kinds of dags.
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