Scan error on column index 2, name \"checkpoint_write_time\": converting driver.Value type float64 (\"6.594096e+06\") to a int: invalid syntax

[ekzyis]

What did you do?

$ git clone https://github.com/prometheus-community/postgres_exporter
$ cd postgres_exporter
$ make build
$ DATA_SOURCE_NAME="postgresql://postgres:password@localhost:5432/postgres?sslmode=disable" ./postgres_exporter

Different terminal:

$ curl localhost:9187/metrics

What did you expect to see?

No error in logs

What did you see instead? Under which circumstances?

Error in exporter:

ts=2022-04-17T19:30:00.357Z caller=collector.go:196 level=error msg="collector failed" name=bgwriter duration_seconds=0.002077823 err="sql: Scan error on column index 2, name \"checkpoint_write_time\": converting driver.Value type float64 (\"6.594096e+06\") to a int: invalid syntax"

Environment

• System information: Linux 5.10.109-1-MANJARO x86_64

• postgres_exporter version:

postgres_exporter, version 0.10.1 (branch: master, revision: 92bdb8755de886b2366de245e559538030ba3668)
  build user:       ekzyis@ekzyis-n131wu
  build date:       20220417-19:23:22
  go version:       go1.18
  platform:         linux/amd64

• postgres_exporter flags: no flags

• PostgreSQL version: 13.6 using this image: timescale/timescaledb:2.6.1-pg13

• Logs: no logs

[ekzyis]

What is interesting, on the same machine, using the docker command, it works

docker run \
  --net=host \
  -e DATA_SOURCE_NAME="postgresql://postgres:password@localhost:5432/postgres?sslmode=disable" \
  quay.io/prometheuscommunity/postgres-exporter

On a different machine, both commands work (compiled and using the docker image).

The other machine output of uname -srm: Linux 5.10.96-1-MANJARO x86_64

[vishal-h]

--- a/collector/pg_stat_bgwriter.go
+++ b/collector/pg_stat_bgwriter.go
@@ -126,7 +126,7 @@ func (PGStatBGWriterCollector) Update(ctx context.Context, server *server, ch ch

        var cpt int
        var cpr int
-       var cpwt int
+       var cpwt float64
        var cpst int
        var bcp int
        var bc int

This fixes the issue.

[avdicl]

--- a/collector/pg_stat_bgwriter.go
+++ b/collector/pg_stat_bgwriter.go
@@ -126,7 +126,7 @@ func (PGStatBGWriterCollector) Update(ctx context.Context, server *server, ch ch

        var cpt int
        var cpr int
-       var cpwt int
+       var cpwt float64
        var cpst int
        var bcp int
        var bc int

This fixes the issue.

Wondering if we can get this minor change merged in for the next release?

[n-rodriguez]

Wondering if we can get this minor change merged in for the next release?

Please! Thank you!

[n-rodriguez]

Will also need this one : #667

Thank you!

[jabbors]

This is affecting version 0.11.0 as well.

[psapezhka728839]

Hello!

When will the next release be? This error breaks the latest one.