Missing timer metric dag.loading-duration.<dag_file> in documentation

[wolfier]

Apache Airflow version: doc on version 1.10.6+

In 1.10.5 metrics documentation, there is an entry for dag.loading-duration.<dag_id>.

In 1.10.6 metrics documentation, the entry disappeared.

The format has also change from dag.loading-duration.<dag_file> to dag.loading-duration.<dag_id> starting from 1.10.4 according to this JIRA ticket and PR.

[kaxil]

Thanks, will check

[kaxil]

So the issue was although the docs were updated in 1.10.6 the code wasn't. But the metric dag.loading-duration.<dag_id> was emitted (also in Airflow 1.10.12)

From Airflow 1.10.13 this metric will be changed to dag_processing.loading-duration.<dag_file> (#5890 has been cherry-picked)

[kaxil]

(#5890 has been cherry-picked)