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Make the metrics less racy (#4061)

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Amber Brown 2018-10-19 21:45:45 +11:00 • committed by GitHub
parent 6a4d01ee94
commit b69216f768
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3 changed files with 22 additions and 16 deletions
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31
synapse/http/request_metrics.py
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@ -39,7 +39,8 @@ outgoing_responses_counter = Counter(
)
response_timer = Histogram(
"synapse_http_server_response_time_seconds", "sec",
"synapse_http_server_response_time_seconds",
"sec",
["method", "servlet", "tag", "code"],
)
@ -79,15 +80,11 @@ response_size = Counter(
# than when the response was written.
in_flight_requests_ru_utime = Counter(
"synapse_http_server_in_flight_requests_ru_utime_seconds",
"",
["method", "servlet"],
"synapse_http_server_in_flight_requests_ru_utime_seconds", "", ["method", "servlet"]
)
in_flight_requests_ru_stime = Counter(
"synapse_http_server_in_flight_requests_ru_stime_seconds",
"",
["method", "servlet"],
"synapse_http_server_in_flight_requests_ru_stime_seconds", "", ["method", "servlet"]
)
in_flight_requests_db_txn_count = Counter(
@ -134,7 +131,7 @@ def _get_in_flight_counts():
# type
counts = {}
for rm in reqs:
key = (rm.method, rm.name,)
key = (rm.method, rm.name)
counts[key] = counts.get(key, 0) + 1
return counts
@ -175,7 +172,8 @@ class RequestMetrics(object):
if context != self.start_context:
logger.warn(
"Context have unexpectedly changed %r, %r",
context, self.start_context
context,
self.start_context,
)
return
@ -192,10 +190,10 @@ class RequestMetrics(object):
resource_usage = context.get_resource_usage()
response_ru_utime.labels(self.method, self.name, tag).inc(
resource_usage.ru_utime,
resource_usage.ru_utime
)
response_ru_stime.labels(self.method, self.name, tag).inc(
resource_usage.ru_stime,
resource_usage.ru_stime
)
response_db_txn_count.labels(self.method, self.name, tag).inc(
resource_usage.db_txn_count
@ -222,8 +220,15 @@ class RequestMetrics(object):
diff = new_stats - self._request_stats
self._request_stats = new_stats
in_flight_requests_ru_utime.labels(self.method, self.name).inc(diff.ru_utime)
in_flight_requests_ru_stime.labels(self.method, self.name).inc(diff.ru_stime)
# max() is used since rapid use of ru_stime/ru_utime can end up with the
# count going backwards due to NTP, time smearing, fine-grained
# correction, or floating points. Who knows, really?
in_flight_requests_ru_utime.labels(self.method, self.name).inc(
max(diff.ru_utime, 0)
)
in_flight_requests_ru_stime.labels(self.method, self.name).inc(
max(diff.ru_stime, 0)
)
in_flight_requests_db_txn_count.labels(self.method, self.name).inc(
diff.db_txn_count