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chore(storage/remote): collect maxTimestamp when value is 0 as well.

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This change enables the PrometheusRemoteWriteBehind alert’s expression to be evaluated
even when the remote endpoint has never been reached. As a result, PrometheusRemoteWriteBehind
will fire to easily detect configuration mistakes (such as incorrect endpoint URLs) or
unrecoverable connectivity issues.

See https://github.com/prometheus/prometheus/issues/14350 for details.

Signed-off-by: machine424 <ayoubmrini424@gmail.com>
This commit is contained in:
machine424 2024-07-08 18:53:17 +02:00 committed by Ayoub Mrini
parent 58963f7b2e
commit caa71fb3c7
4 changed files with 3 additions and 9 deletions
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6
storage/remote/max_timestamp.go
View file

@ -39,9 +39,3 @@ func (m *maxTimestamp) Get() float64 {
defer m.mtx.Unlock() defer m.mtx.Unlock()
return m.value return m.value
} }
func (m *maxTimestamp) Collect(c chan<- prometheus.Metric) {
if m.Get() > 0 {
m.Gauge.Collect(c)
}
}

2
storage/remote/queue_manager.go
View file

@ -232,7 +232,7 @@ func newQueueManagerMetrics(r prometheus.Registerer, rn, e string) *queueManager
Namespace: namespace, Namespace: namespace,
Subsystem: subsystem, Subsystem: subsystem,
Name: "queue_highest_sent_timestamp_seconds", Name: "queue_highest_sent_timestamp_seconds",
Help: "Timestamp from a WAL sample, the highest timestamp successfully sent by this queue, in seconds since epoch.", Help: "Timestamp from a WAL sample, the highest timestamp successfully sent by this queue, in seconds since epoch. Initialized to 0 when no data has been sent yet.",
ConstLabels: constLabels, ConstLabels: constLabels,
}), }),
} }

2
storage/remote/queue_manager_test.go
View file

@ -60,7 +60,7 @@ func newHighestTimestampMetric() *maxTimestamp {
Namespace: namespace, Namespace: namespace,
Subsystem: subsystem, Subsystem: subsystem,
Name: "highest_timestamp_in_seconds", Name: "highest_timestamp_in_seconds",
Help: "Highest timestamp that has come into the remote storage via the Appender interface, in seconds since epoch.", Help: "Highest timestamp that has come into the remote storage via the Appender interface, in seconds since epoch. Initialized to 0 when no data has been received yet",
}), }),
} }
} }

2
storage/remote/write.go
View file

@ -100,7 +100,7 @@ func NewWriteStorage(logger log.Logger, reg prometheus.Registerer, dir string, f
Namespace: namespace, Namespace: namespace,
Subsystem: subsystem, Subsystem: subsystem,
Name: "highest_timestamp_in_seconds", Name: "highest_timestamp_in_seconds",
Help: "Highest timestamp that has come into the remote storage via the Appender interface, in seconds since epoch.", Help: "Highest timestamp that has come into the remote storage via the Appender interface, in seconds since epoch. Initialized to 0 when no data has been received yet.",
}), }),
}, },
} }