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Don't spew errors because we can't save metrics (#3563)

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Amber Brown 2018-07-19 20:58:18 +10:00 committed by GitHub
parent ba6477feac
commit 95ccb6e2ec
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3 changed files with 25 additions and 6 deletions
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1
changelog.d/3548.bugfix Normal file
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@ -0,0 +1 @@
Catch failures saving metrics captured by Measure, and instead log the faulty metrics information for further analysis.

11
synapse/util/logcontext.py
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@ -99,6 +99,17 @@ class ContextResourceUsage(object):
self.db_sched_duration_sec = 0
self.evt_db_fetch_count = 0
def __repr__(self):
return ("<ContextResourceUsage ru_stime='%r', ru_utime='%r', "
"db_txn_count='%r', db_txn_duration_sec='%r', "
"db_sched_duration_sec='%r', evt_db_fetch_count='%r'>") % (
self.ru_stime,
self.ru_utime,
self.db_txn_count,
self.db_txn_duration_sec,
self.db_sched_duration_sec,
self.evt_db_fetch_count,)
def __iadd__(self, other):
"""Add another ContextResourceUsage's stats to this one's.

9
synapse/util/metrics.py
View file

@ -104,12 +104,19 @@ class Measure(object):
logger.warn("Expected context. (%r)", self.name)
return
usage = context.get_resource_usage() - self.start_usage
current = context.get_resource_usage()
usage = current - self.start_usage
try:
block_ru_utime.labels(self.name).inc(usage.ru_utime)
block_ru_stime.labels(self.name).inc(usage.ru_stime)
block_db_txn_count.labels(self.name).inc(usage.db_txn_count)
block_db_txn_duration.labels(self.name).inc(usage.db_txn_duration_sec)
block_db_sched_duration.labels(self.name).inc(usage.db_sched_duration_sec)
except ValueError:
logger.warn(
"Failed to save metrics! OLD: %r, NEW: %r",
self.start_usage, current
)
if self.created_context:
self.start_context.__exit__(exc_type, exc_val, exc_tb)