This plugin provides a Matomo API call to generate the export of the tracking queue status for Prometheus.
It is important to use the format=original parameter, to get correct format. If it is missing, or it's set to some
other value, Matomo will wrap the output into something, and it will not work with Prometheus.
Example: https://matomo.makaira.io/index.php?module=API&method=QueueMonitoring.getQueueMetrics&format=original
This will output something like
matomo_queued_requests{id=0} 2
matomo_queued_requests{id=1} 0
matomo_queued_requests{id=2} 0
matomo_queued_requests{id=3} 0
matomo_queued_requests{id=4} 0
matomo_queued_requests{id=5} 16
matomo_queued_requests{id=6} 0
matomo_queued_requests{id=7} 0