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Postgres metrics for stuck getpage requests (#11710)

Browse Source 
https://github.com/neondatabase/neon/issues/10327
Resolves: #11720 

New metrics:
- `compute_getpage_stuck_requests_total`
- `compute_getpage_max_inflight_stuck_time_ms`
This commit is contained in:
Mikhail Kot
2025-04-30 13:01:41 +01:00
committed by GitHub
parent b48404952d
commit 8da4ec9740
7 changed files with 48 additions and 1 deletions
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2
compute/etc/neon_collector.jsonnet
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@@ -23,6 +23,8 @@
import 'sql_exporter/getpage_prefetch_requests_total.libsonnet',
import 'sql_exporter/getpage_prefetches_buffered.libsonnet',
import 'sql_exporter/getpage_sync_requests_total.libsonnet',
import 'sql_exporter/compute_getpage_stuck_requests_total.libsonnet',
import 'sql_exporter/compute_getpage_max_inflight_stuck_time_ms.libsonnet',
import 'sql_exporter/getpage_wait_seconds_bucket.libsonnet',
import 'sql_exporter/getpage_wait_seconds_count.libsonnet',
import 'sql_exporter/getpage_wait_seconds_sum.libsonnet',

9
compute/etc/sql_exporter/compute_getpage_max_inflight_stuck_time_ms.libsonnet Normal file
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@@ -0,0 +1,9 @@
{
metric_name: 'compute_getpage_max_inflight_stuck_time_ms',
type: 'gauge',
help: 'Max wait time for stuck requests among all backends. Includes only active stuck requests, terminated or disconnected ones are not accounted for',
values: [
'compute_getpage_max_inflight_stuck_time_ms',
],
query_ref: 'neon_perf_counters',
}

9
compute/etc/sql_exporter/compute_getpage_stuck_requests_total.libsonnet Normal file
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@@ -0,0 +1,9 @@
{
metric_name: 'compute_getpage_stuck_requests_total',
type: 'counter',
help: 'Total number of Getpage requests left without an answer for more than pageserver_response_log_timeout but less than pageserver_response_disconnect_timeout',
values: [
'compute_getpage_stuck_requests_total',
],
query_ref: 'neon_perf_counters',
}

2
compute/etc/sql_exporter/neon_perf_counters.sql
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@@ -9,6 +9,8 @@ SELECT d.* FROM pg_catalog.jsonb_to_record((SELECT jb FROM c)) AS d(
getpage_wait_seconds_sum numeric,
getpage_prefetch_requests_total numeric,
getpage_sync_requests_total numeric,
compute_getpage_stuck_requests_total numeric,
compute_getpage_max_inflight_stuck_time_ms numeric,
getpage_prefetch_misses_total numeric,
getpage_prefetch_discards_total numeric,
getpage_prefetches_buffered numeric,