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Exporting file_cache_used to calculate LFC utilization (#11384)

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## Problem

Exporting `file_cache_used` which specifies the number of used chunks in
the LFC. This helps calculate LFC utilization as: `file_cache_used_pages
/ (file_cache_used * file_cache_chunk_size_pages)`

## Summary of changes

Exporting `file_cache_used`.

Related Issue: https://github.com/neondatabase/cloud/issues/26688
This commit is contained in:
Suhas Thalanki
2025-04-03 10:54:45 -04:00
committed by GitHub
parent d8cee52637
commit 46e046e779
3 changed files with 12 additions and 0 deletions
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1
compute/etc/neon_collector.jsonnet
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@@ -33,6 +33,7 @@
import 'sql_exporter/lfc_hits.libsonnet',
import 'sql_exporter/lfc_misses.libsonnet',
import 'sql_exporter/lfc_used.libsonnet',
import 'sql_exporter/lfc_used_pages.libsonnet',
import 'sql_exporter/lfc_writes.libsonnet',
import 'sql_exporter/logical_slot_restart_lsn.libsonnet',
import 'sql_exporter/max_cluster_size.libsonnet',

10
compute/etc/sql_exporter/lfc_used_pages.libsonnet Normal file
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@@ -0,0 +1,10 @@
{
metric_name: 'lfc_used_pages',
type: 'gauge',
help: 'LFC pages used',
key_labels: null,
values: [
'lfc_used_pages',
],
query: importstr 'sql_exporter/lfc_used_pages.sql',
}

1
compute/etc/sql_exporter/lfc_used_pages.sql Normal file
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@@ -0,0 +1 @@
SELECT lfc_value AS lfc_used_pages FROM neon.neon_lfc_stats WHERE lfc_key = 'file_cache_used_pages';