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When we finish processing a request, log the number of events we fetched from
the database to handle it.
[I'm trying to figure out which requests are responsible for large amounts of
event cache churn. It may turn out to be more helpful to add counts to the
prometheus per-request/block metrics, but that is an extension to this code
anyway.]
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use repr, not str
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Signed-off-by: Adrian Tschira <nota@notafile.com>
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This tracks CPU and DB usage while requests are in flight, rather than
when we write the response.
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(instead of everywhere that writes a response. Or rather, the subset of places
which write responses where we haven't forgotten it).
This also means that we don't have to have the mysterious version_string
attribute in anything with a request handler.
Unfortunately it does mean that we have to pass the version string wherever we
instantiate a SynapseSite, which has been c&ped 150 times, but that is code
that ought to be cleaned up anyway really.
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It fits quite nicely here, and opens the path to getting rid of the
"include_metrics" mess.
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This has no effect on python2
Signed-off-by: Adrian Tschira <nota@notafile.com>
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For each request, track the amount of time spent waiting for a db
connection. This entails adding it to the LoggingContext and we may as well add
metrics for it while we are passing.
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... to reduce the amount of floating-point foo we do.
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what could possibly go wrong
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