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Have a custom prefix for each of the default metrics created by postgres_exporter #387

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Merged
merged 4 commits into from
Dec 24, 2020
Merged

Have a custom prefix for each of the default metrics created by postgres_exporter #387

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759346d
Fixes (#364)
ajaybhat Feb 12, 2020
818cec5
Merge branch 'master' into metric-prefix-changes
ajaybhat Mar 31, 2020
70e49f2
Merge branch 'master' into metric-prefix-changes
wrouesnel Apr 9, 2020
1f16223
Merge branch 'master' into metric-prefix-changes
wrouesnel Dec 24, 2020
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3 changes: 3 additions & 0 deletions README.md
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Expand Up @@ -140,6 +140,9 @@ The following environment variables configure the exporter:
* `PG_EXPORTER_EXCLUDE_DATABASES`
A comma-separated list of databases to remove when autoDiscoverDatabases is enabled. Default is empty string.

* `PG_EXPORTER_METRIC_PREFIX`
A prefix to use for each of the default metrics exported by postgres-exporter. Default is `pg`

Settings set by environment variables starting with `PG_` will be overwritten by the corresponding CLI flag if given.

### Setting the Postgres server's data source name
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3 changes: 3 additions & 0 deletions cmd/postgres_exporter/postgres_exporter.go
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Expand Up @@ -53,6 +53,7 @@ var (
onlyDumpMaps = kingpin.Flag("dumpmaps", "Do not run, simply dump the maps.").Bool()
constantLabelsList = kingpin.Flag("constantLabels", "A list of label=value separated by comma(,).").Default("").Envar("PG_EXPORTER_CONSTANT_LABELS").String()
excludeDatabases = kingpin.Flag("exclude-databases", "A list of databases to remove when autoDiscoverDatabases is enabled").Default("").Envar("PG_EXPORTER_EXCLUDE_DATABASES").String()
metricPrefix = kingpin.Flag("metric-prefix", "A metric prefix can be used to have non-default (not \"pg\") prefixes for each of the metrics").Default("pg").Envar("PG_EXPORTER_METRIC_PREFIX").String()
)

// Metric name parts.
Expand Down Expand Up @@ -626,6 +627,8 @@ func makeDescMap(pgVersion semver.Version, serverLabels prometheus.Labels, metri
}
}

namespace := strings.Replace(namespace, "pg", *metricPrefix, 1)

// Determine how to convert the column based on its usage.
// nolint: dupl
switch columnMapping.usage {
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