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Add prometheus metrics for destination queues, sync requests

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Squashed commit of the following:

commit 7ed1c6cfe67429dbe378a763d832c150eb0f781d
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Wed Dec 16 14:53:27 2020 +0000

    Updates

commit 8442099d08760b8d086e6d58f9f30284e378a2cd
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Wed Dec 16 14:43:18 2020 +0000

    Add some sync statistics

commit ffe2a11644ed3d5297d1775a680886c574143fdb
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Wed Dec 16 14:37:00 2020 +0000

    Fix backing off display

commit 27443a93855aa60a49806ecabbf9b09f818301bd
Author: Neil Alexander <neilalexander@users.noreply.github.com>
Date:   Wed Dec 16 14:28:43 2020 +0000

    Add some destination queue metrics
This commit is contained in:
Neil Alexander 2020-12-16 15:02:39 +00:00
parent b891c00b09
commit 56b5847c74
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3 changed files with 70 additions and 0 deletions
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31
syncapi/sync/requestpool.go
View file

@ -35,6 +35,7 @@ import (
userapi "github.com/matrix-org/dendrite/userapi/api"
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/util"
"github.com/prometheus/client_golang/prometheus"
log "github.com/sirupsen/logrus"
)
@ -99,6 +100,30 @@ func (rp *RequestPool) updateLastSeen(req *http.Request, device *userapi.Device)
rp.lastseen.Store(device.UserID+device.ID, time.Now())
}
func init() {
prometheus.MustRegister(
activeSyncRequests, waitingSyncRequests,
)
}
var activeSyncRequests = prometheus.NewGauge(
prometheus.GaugeOpts{
Namespace: "dendrite",
Subsystem: "syncapi",
Name: "active_sync_requests",
Help: "The number of sync requests that are active right now",
},
)
var waitingSyncRequests = prometheus.NewGauge(
prometheus.GaugeOpts{
Namespace: "dendrite",
Subsystem: "syncapi",
Name: "waiting_sync_requests",
Help: "The number of sync requests that are waiting to be woken by a notifier",
},
)
// OnIncomingSyncRequest is called when a client makes a /sync request. This function MUST be
// called in a dedicated goroutine for this request. This function will block the goroutine
// until a response is ready, or it times out.
@ -122,6 +147,9 @@ func (rp *RequestPool) OnIncomingSyncRequest(req *http.Request, device *userapi.
"limit": syncReq.limit,
})
activeSyncRequests.Inc()
defer activeSyncRequests.Dec()
rp.updateLastSeen(req, device)
currPos := rp.notifier.CurrentPosition()
@ -139,6 +167,9 @@ func (rp *RequestPool) OnIncomingSyncRequest(req *http.Request, device *userapi.
}
}
waitingSyncRequests.Inc()
defer waitingSyncRequests.Dec()
// Otherwise, we wait for the notifier to tell us if something *may* have
// happened. We loop in case it turns out that nothing did happen.