for version 1.2.x I want to look into adding a 'simple' /metrics endpoint that returns some stats in a prometheus compliant format.
* total number of push messages ?
* total number of push applications ?
* total number of devices ?
similar per user - that she sees the stats for her own stuff ?
e.g.
* total number MY of push messages ?
* total number MY of push applications ?
* total number MY of devices ?
Thoughts ?
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