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Add metrics for len of new extremities persisted.

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Of new events being persisted add metrics for total size of forward
extremities and number of unchanged, "stale" extremities.
This commit is contained in:
Erik Johnston 2019-06-17 16:20:20 +01:00
parent 6840ebeef8
commit 499d4a32cd
1 changed files with 23 additions and 1 deletions
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24
synapse/storage/events.py
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@ -24,7 +24,7 @@ from six import iteritems, text_type
from six.moves import range
from canonicaljson import json
from prometheus_client import Counter
from prometheus_client import Counter, Histogram
from twisted.internet import defer
@ -74,6 +74,19 @@ state_delta_reuse_delta_counter = Counter(
"synapse_storage_events_state_delta_reuse_delta", ""
)
# The number of forward extremities for each new event.
forward_extremities_counter = Histogram(
"synapse_storage_events_forward_extremities_persisted", "",
buckets=(1, 2, 3, 5, 7, 10, 15, 20, 50, 100, 200, 500, "+Inf")
)
# The number of stale forward extremities for each new event. Stale extremities
# are those that were in the previous set of extremities as well as the new.
stale_forward_extremities_counter = Histogram(
"synapse_storage_events_stale_forward_extremities_persisted", "",
buckets=(0, 1, 2, 3, 5, 7, 10, 15, 20, 50, 100, 200, 500, "+Inf")
)
def encode_json(json_object):
"""
@ -541,6 +554,8 @@ class EventsStore(
and not event.internal_metadata.is_soft_failed()
]
latest_event_ids = set(latest_event_ids)
# start with the existing forward extremities
result = set(latest_event_ids)
@ -564,6 +579,13 @@ class EventsStore(
)
result.difference_update(existing_prevs)
# We only update metrics for events that change forward extremities
# (e.g. we ignore backfill/outliers/etc)
if result != latest_event_ids:
forward_extremities_counter.observe(len(result))
stale = set(latest_event_ids) & result
stale_forward_extremities_counter.observe(len(stale))
defer.returnValue(result)
@defer.inlineCallbacks