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fix(compute): Turn off database collector in postgres_exporter (#12684)

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## Problem

`postgres_exporter` has database collector enabled by default and it
doesn't filter out invalid databases, see

06a553c816/collector/pg_database.go (L67)
so if it hits one, it starts spamming logs
```
ERROR:  [NEON_SMGR] [reqid d9700000018] could not read db size of db 705302 from page server at lsn 5/A2457EB0
```

## Summary of changes

We don't use `pg_database_size_bytes` metric anyway, see

5e19b3fd89/apps/base/compute-metrics/scrape-compute-pg-exporter-neon.yaml (L29)
so just turn it off by passing `--no-collector.database`.
This commit is contained in:
Alexey Kondratov
2025-07-24 13:52:31 +02:00
committed by GitHub
parent e82021d6fe
commit ab14521ea5
2 changed files with 14 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
compute/vm-image-spec-bookworm.yaml
View File

@@ -26,7 +26,13 @@ commands:
- name: postgres-exporter
user: nobody
sysvInitAction: respawn
shell: 'DATA_SOURCE_NAME="user=cloud_admin sslmode=disable dbname=postgres application_name=postgres-exporter pgaudit.log=none" /bin/postgres_exporter --config.file=/etc/postgres_exporter.yml'
# Turn off database collector (`--no-collector.database`), we don't use `pg_database_size_bytes` metric anyway, see
# https://github.com/neondatabase/flux-fleet/blob/5e19b3fd897667b70d9a7ad4aa06df0ca22b49ff/apps/base/compute-metrics/scrape-compute-pg-exporter-neon.yaml#L29
# but it's enabled by default and it doesn't filter out invalid databases, see
# https://github.com/prometheus-community/postgres_exporter/blob/06a553c8166512c9d9c5ccf257b0f9bba8751dbc/collector/pg_database.go#L67
# so if it hits one, it starts spamming logs
# ERROR: [NEON_SMGR] [reqid d9700000018] could not read db size of db 705302 from page server at lsn 5/A2457EB0
shell: 'DATA_SOURCE_NAME="user=cloud_admin sslmode=disable dbname=postgres application_name=postgres-exporter pgaudit.log=none" /bin/postgres_exporter --no-collector.database --config.file=/etc/postgres_exporter.yml'
- name: pgbouncer-exporter
user: postgres
sysvInitAction: respawn

8
compute/vm-image-spec-bullseye.yaml
View File

@@ -26,7 +26,13 @@ commands:
- name: postgres-exporter
user: nobody
sysvInitAction: respawn
shell: 'DATA_SOURCE_NAME="user=cloud_admin sslmode=disable dbname=postgres application_name=postgres-exporter pgaudit.log=none" /bin/postgres_exporter --config.file=/etc/postgres_exporter.yml'
# Turn off database collector (`--no-collector.database`), we don't use `pg_database_size_bytes` metric anyway, see
# https://github.com/neondatabase/flux-fleet/blob/5e19b3fd897667b70d9a7ad4aa06df0ca22b49ff/apps/base/compute-metrics/scrape-compute-pg-exporter-neon.yaml#L29
# but it's enabled by default and it doesn't filter out invalid databases, see
# https://github.com/prometheus-community/postgres_exporter/blob/06a553c8166512c9d9c5ccf257b0f9bba8751dbc/collector/pg_database.go#L67
# so if it hits one, it starts spamming logs
# ERROR: [NEON_SMGR] [reqid d9700000018] could not read db size of db 705302 from page server at lsn 5/A2457EB0
shell: 'DATA_SOURCE_NAME="user=cloud_admin sslmode=disable dbname=postgres application_name=postgres-exporter pgaudit.log=none" /bin/postgres_exporter --no-collector.database --config.file=/etc/postgres_exporter.yml'
- name: pgbouncer-exporter
user: postgres
sysvInitAction: respawn