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add a last seen metric (#3396)
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@ -190,6 +190,22 @@ event_processing_last_ts = Gauge("synapse_event_processing_last_ts", "", ["name"
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# finished being processed.
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event_processing_lag = Gauge("synapse_event_processing_lag", "", ["name"])
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last_ticked = time.time()
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class ReactorLastSeenMetric(object):
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def collect(self):
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cm = GaugeMetricFamily(
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"python_twisted_reactor_last_seen",
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"Seconds since the Twisted reactor was last seen",
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)
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cm.add_metric([], time.time() - last_ticked)
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yield cm
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REGISTRY.register(ReactorLastSeenMetric())
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def runUntilCurrentTimer(func):
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@ -222,6 +238,11 @@ def runUntilCurrentTimer(func):
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tick_time.observe(end - start)
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pending_calls_metric.observe(num_pending)
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# Update the time we last ticked, for the metric to test whether
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# Synapse's reactor has frozen
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global last_ticked
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last_ticked = end
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if running_on_pypy:
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return ret
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