Bert Hekman

Sure. What OS are you running (Ubuntu? Mint?) and which version (18.04 probably?). Can you also show me the output of `lsusb`? And the contents of the file `/lib/udev/rules.d/90-pulseaudio.rules`?

Your system is already configured properly. The device id (`1038:12ad`) can be found in the lsusb output and is also in the pulseaudio udev config which makes sure that the...

Cool! No problem :)

A DAG can have multiple instances running at the same time. This would conflict with the metric which has one run time per DAG. Also, returning the current runtime makes...

Try something like: `rate(airflow_dag_run_state{state="failed"}[5m]) > 0`

Determining how many tasks are running is not possible (yet at least...) You can however use the `airflow_dag_run_state` metric to see how many and when certain events happened (`success`, `failed`,...