API: add a new endpoint to export metrics in Prometheus format #1126
Description
Relates to: torrust/torrust-demo#20
Context
The only way to see tracker metrics is via this API endpoint:
{
"torrents": 378783,
"seeders": 63963,
"completed": 394744,
"leechers": 171286,
"tcp4_connections_handled": 648,
"tcp4_announces_handled": 647,
"tcp4_scrapes_handled": 1,
"tcp6_connections_handled": 0,
"tcp6_announces_handled": 0,
"tcp6_scrapes_handled": 0,
"udp4_connections_handled": 220330443,
"udp4_announces_handled": 649148603,
"udp4_scrapes_handled": 14483989,
"udp6_connections_handled": 0,
"udp6_announces_handled": 0,
"udp6_scrapes_handled": 0
}The endpoint doesn't include aggregate or historical data. To manage the tracker, having a dashboard with graphs for the data we collect would be very helpful.
Proposal
Add a new API endpoint returning stats in plain text that are ready to be consumed by Prometheus.
torrents 1
seeders 1
completed 0
leechers 0
tcp4_connections_handled 648
tcp4_announces_handled 647
tcp4_scrapes_handled 1
tcp6_connections_handled: 0
tcp6_announces_handled 0
tcp6_scrapes_handled 0
udp4_connections_handled 2200443
udp4_announces_handled 6498603
udp4_scrapes_handled 143989
udp6_connections_handled 0
udp6_announces_handled 0
udp6_scrapes_handled 0
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