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Improve reactor_tick_time metric (#11724)

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The existing implementation of the `python_twisted_reactor_tick_time` metric is pretty useless, because it *only* 
measures the time taken to execute timed calls and callbacks from threads. That neglects everything that 
happens off the back of I/O, which is obviously quite a lot for us.

To improve this, I've hooked into a different place in the reactor - in particular, where it calls `epoll`. That call is 
the only place it should wait for something to happen - the rest of the loop *should* be quick.

I've also removed `python_twisted_reactor_pending_calls`, because I don't believe anyone ever looks at it, and
it's a nuisance to populate.
This commit is contained in:
Richard van der Hoff 2022-01-17 12:14:40 +00:00 • committed by GitHub
parent 6b241f5286
commit 6a78ede569
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5 changed files with 86 additions and 109 deletions
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contrib/prometheus/consoles/synapse.html
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@ -92,22 +92,6 @@ new PromConsole.Graph({
})
</script>
<h3>Pending calls per tick</h3>
<div id="reactor_pending_calls"></div>
<script>
new PromConsole.Graph({
node: document.querySelector("#reactor_pending_calls"),
expr: "rate(python_twisted_reactor_pending_calls_sum[30s]) / rate(python_twisted_reactor_pending_calls_count[30s])",
name: "[[job]]-[[index]]",
min: 0,
renderer: "line",
height: 150,
yAxisFormatter: PromConsole.NumberFormatter.humanize,
yHoverFormatter: PromConsole.NumberFormatter.humanize,
yTitle: "Pending Calls"
})
</script>
<h1>Storage</h1>
<h3>Queries</h3>