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add a last seen metric (#3396)

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Amber Brown 2018-06-14 20:26:59 +10:00 committed by GitHub
parent a61738b316
commit f116f32ace
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1 changed files with 21 additions and 0 deletions
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21
synapse/metrics/__init__.py
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@ -190,6 +190,22 @@ event_processing_last_ts = Gauge("synapse_event_processing_last_ts", "", ["name"
# finished being processed. # finished being processed.
event_processing_lag = Gauge("synapse_event_processing_lag", "", ["name"]) event_processing_lag = Gauge("synapse_event_processing_lag", "", ["name"])
last_ticked = time.time()
class ReactorLastSeenMetric(object):
def collect(self):
cm = GaugeMetricFamily(
"python_twisted_reactor_last_seen",
"Seconds since the Twisted reactor was last seen",
)
cm.add_metric([], time.time() - last_ticked)
yield cm
REGISTRY.register(ReactorLastSeenMetric())
def runUntilCurrentTimer(func): def runUntilCurrentTimer(func):
@ -222,6 +238,11 @@ def runUntilCurrentTimer(func):
tick_time.observe(end - start) tick_time.observe(end - start)
pending_calls_metric.observe(num_pending) pending_calls_metric.observe(num_pending)
# Update the time we last ticked, for the metric to test whether
# Synapse's reactor has frozen
global last_ticked
last_ticked = end
if running_on_pypy: if running_on_pypy:
return ret return ret