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feat: expose DERP server debug metrics#12135

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Merged
spikecurtis merged 1 commit intomainfromspike/derp-debug-metrics
Feb 14, 2024

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@spikecurtisspikecurtis commentedFeb 14, 2024
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Adds some debug endpoints for looking into the DERP server.

Theapi/v2/debug/derp/traffic endpoint requires thess utility to be present in order to function. I havenot added theiproute2 package to our base image as it adds 11MB, so this endpoint won't be useful by default. However, in a debugging situation, we could exec into the container and thenapk add iproute2, or build a special debug image.

Theapi/v2/debug/expvar handler contains DERP metrics as well as commandline and memstats.

Example:

{"alert_failed": 0,"alert_generated": 0,"cmdline": ["/Users/spike/repos/coder/build/coder_darwin_arm64","--global-config","/Users/spike/repos/coder/.coderv2","server","--http-address","0.0.0.0:3000","--swagger-enable","--access-url","http://127.0.0.1:3000","--dangerous-allow-cors-requests=true"],"derp": {"accepts": 1, "average_queue_duration_ms": 0, "bytes_received": 0, "bytes_sent": 0, "counter_packets_dropped_reason": {"gone_disconnected": 0, "gone_not_here": 0, "queue_head": 0, "queue_tail": 0, "unknown_dest": 0, "unknown_dest_on_fwd": 0, "write_error": 0}, "counter_packets_dropped_type": {"disco": 0, "other": 0}, "counter_packets_received_kind": {"disco": 0, "other": 0}, "counter_tcp_rtt": {}, "counter_total_dup_client_conns": 0, "gauge_clients_local": 1, "gauge_clients_remote": 0, "gauge_clients_total": 1, "gauge_current_connections": 1, "gauge_current_dup_client_conns": 0, "gauge_current_dup_client_keys": 0, "gauge_current_file_descriptors": 0, "gauge_current_home_connections": 1, "gauge_memstats_sys0": 20874504, "gauge_watchers": 0, "got_ping": 0, "home_moves_in": 0, "home_moves_out": 0, "multiforwarder_created": 0, "multiforwarder_deleted": 0, "packet_forwarder_delete_other_value": 0, "packets_dropped": 0, "packets_forwarded_in": 0, "packets_forwarded_out": 0, "packets_received": 0, "packets_sent": 0, "peer_gone_disconnected_frames": 0, "peer_gone_not_here_frames": 0, "sent_pong": 0, "unknown_frames": 0, "version": "1.47.0-dev20240214-t64db8c604"},"memstats": 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0,"warning_generated": 0}

If we find the DERP metrics useful we could consider how to include them in Prometheus scrapes based on the tailnetvarz package. That's for a later PR if at all.

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@spikecurtisspikecurtis marked this pull request as ready for reviewFebruary 14, 2024 06:42
r.Route("/derp", func(r chi.Router) {
r.Get("/traffic", options.DERPServer.ServeDebugTraffic)
})
r.Mount("/expvar", expvar.Handler()) // contains DERP metrics as well as cmdline and memstats
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Sucks that they don't expose prometheus metrics :/

We might have to write a converter from these expvar values to prometheus values

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Yeah, but I'll save that for a different PR if we find these useful.

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I'm for building a special debug image as it is not a good practice to disable readOnlyRootFS. So we've then to modify our Helm Chart or deployment for debugging purpose.

@spikecurtisspikecurtis merged commit5a0d240 intomainFeb 14, 2024
@spikecurtisspikecurtis deleted the spike/derp-debug-metrics branchFebruary 14, 2024 11:11
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@deansheatherdeansheatherdeansheather approved these changes

@coadlercoadlerAwaiting requested review from coadler

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