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chore: use prom to measure celery queue depth #17682

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Sep 29, 2023
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8 changes: 8 additions & 0 deletions posthog/celery.py
Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,11 @@
labelnames=["task_name"],
)

CELERY_TASK_QUEUE_DEPTH_GAUGE = Gauge(
"posthog_celery_queue_depth",
"We use this to monitor the depth of the celery queue.",
)

# Using a string here means the worker doesn't have to serialize
# the configuration object to child processes.
# - namespace='CELERY' means all celery-related configuration keys
Expand Down Expand Up @@ -684,6 +689,9 @@ def redis_celery_queue_depth():

try:
llen = get_client().llen("celery")
CELERY_TASK_QUEUE_DEPTH_GAUGE.set(llen)

# TODO this can be removed once we're using the prom metric for alerting
with pushed_metrics_registry("celery_redis_queue_depth") as registry:
depth_gauge = Gauge(
"posthog_celery_queue_depth",
Expand Down