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Replace last_*_pdu_age metrics with timestamps (#9540)

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Following the advice at
https://prometheus.io/docs/practices/instrumentation/#timestamps-not-time-since,
it's preferable to export unix timestamps, not ages.

There doesn't seem to be any particular naming convention for timestamp
metrics.
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Richard van der Hoff 2021-03-04 16:40:18 +00:00 • committed by GitHub
parent df425c2c63
commit 8a4b3738f3
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4 changed files with 11 additions and 12 deletions
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11
synapse/federation/sender/transaction_manager.py
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@ -36,9 +36,9 @@ if TYPE_CHECKING:
logger = logging.getLogger(__name__)
last_pdu_age_metric = Gauge(
"synapse_federation_last_sent_pdu_age",
"The age (in seconds) of the last PDU successfully sent to the given domain",
last_pdu_ts_metric = Gauge(
"synapse_federation_last_sent_pdu_time",
"The timestamp of the last PDU which was successfully sent to the given domain",
labelnames=("server_name",),
)
@ -187,9 +187,8 @@ class TransactionManager:
if success and pdus and destination in self._federation_metrics_domains:
last_pdu = pdus[-1]
last_pdu_age = self.clock.time_msec() - last_pdu.origin_server_ts
last_pdu_age_metric.labels(server_name=destination).set(
last_pdu_age / 1000
last_pdu_ts_metric.labels(server_name=destination).set(
last_pdu.origin_server_ts / 1000
)
set_tag(tags.ERROR, not success)