duplicated output

[retsys]

Hello,
I'm running airflow-prometheus-exporter v1.0.8 in airflow v1.10.10
Seems to be a cartesian in the output.
Lines containing "airflow_dag_run_duration{dag_id=..." are repeated multiple times for each dag.
Seems to be one line for each dag run across all dags.

As in, airflow reports a total of y dag runs since it started if you sum up all dag runs from all dags.
Then there are y lines of "airflow_dag_run_duration{dag_id=..." in this output for each dag.
Lots of dags x lots of dag runs = lots of output and growing all the time.
Meaning scrape times are growing too.
Cheers

[qiuwei]

confirm that I also encountered the same issue.

[jutley]

We are running into this as well. When it runs for long enough, the result is that metrics take so long to return that we essentially lose our airflow metrics.

[andreyvital]

Same issue here!

[jward-bw]

I have a PR raised to fix this, but it seems that the owner of the repo is no longer active:
#25