prom.md

Prometheus exporter

The goal of this version is to offer a few basic metrics for initial testing. The set of supported metrics can be extended.

The current implementation is partly unconventional in that it creates new metrics each time but does not register a custom collector. Reasons are that the exporter should clear out metrics for closed connections but that prom-client does not yet support custom collectors.

This version has been ported from an earlier Python version that was not part of edumeet but connected as an interactive client.

Configuration

See prometheus in server/config/config.example.js for options and applicable defaults.

If edumeet was installed with mm-absible it may be necessary to open the iptables firewall for incoming TCP traffic on the allocated port (see /etc/ferm/ferm.conf).

Metrics

metric	value
edumeet_peers
edumeet_rooms
mediasoup_consumer_byte_count_bytes	byteCount
mediasoup_consumer_score	score
mediasoup_producer_byte_count_bytes	byteCount
mediasoup_producer_score	score

Architecture

+-----------+      +---------------------------------------------+
| workers   |      | server                    observer API      |
|           | sock |                    +------o------+----o-----+
|           +------+                    | int. server | exporter |
|           |      |                    |             |          |
| mediasoup |      | express  socket.io |     net     | express  |
+-----+-----+      +----+---------+-----+-----+-------+-----+----+
      ^ min-max         ^ 443     ^ 443       ^ sock        ^ 8889
      | RTP             | HTTPS   | ws        |             | HTTP
      |                 |         |           |             |
      |               +-+---------+-+  +------+------+  +---+--------+
      +---------------+     app     |  | int. client |  | Prometheus |
                      +-------------+  +-------------+  +------------+