jacobpascual/postgres_exporter
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Add connection limits metrics for pg_roles and pg_database (#997)

Browse Source 
* Add database connection limits metrics

Signed-off-by: Jocelyn Thode <jocelyn@thode.email>

* Add roles connection limits metrics

Signed-off-by: Jocelyn Thode <jocelyn@thode.email>

* Fix copyright year

Co-authored-by: Joe Adams <github@joeadams.io>
Signed-off-by: Jocelyn Thode <jocelynthode@users.noreply.github.com>

* Fix spacing in pgDatabaseQuery

Co-authored-by: Joe Adams <github@joeadams.io>
Signed-off-by: Jocelyn Thode <jocelynthode@users.noreply.github.com>

* Fix case on pgRolesConnectionLimitsQuery

Co-authored-by: Joe Adams <github@joeadams.io>
Signed-off-by: Jocelyn Thode <jocelynthode@users.noreply.github.com>

* Do not add roleMetrics when row is not valid

Signed-off-by: Jocelyn Thode <jocelyn@thode.email>

---------

Signed-off-by: Jocelyn Thode <jocelyn@thode.email>
Signed-off-by: Jocelyn Thode <jocelynthode@users.noreply.github.com>
Co-authored-by: Joe Adams <github@joeadams.io>
This commit is contained in:
Jocelyn Thode
2024-02-22 03:10:17 +01:00
committed by GitHub
parent f98834a678
commit 8f39f5b114
4 changed files with 181 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
collector/pg_database.go
View File

@@ -53,12 +53,21 @@ var (
"Disk space used by the database",
[]string{"datname"}, nil,
)
pgDatabaseConnectionLimitsDesc = prometheus.NewDesc(
prometheus.BuildFQName(
namespace,
databaseSubsystem,
"connection_limit",
),
"Connection limit set for the database",
[]string{"datname"}, nil,
)
pgDatabaseQuery = "SELECT pg_database.datname FROM pg_database;"
pgDatabaseQuery = "SELECT pg_database.datname, pg_database.datconnlimit FROM pg_database;"
pgDatabaseSizeQuery = "SELECT pg_database_size($1)"
)
// Update implements Collector and exposes database size.
// Update implements Collector and exposes database size and connection limits.
// It is called by the Prometheus registry when collecting metrics.
// The list of databases is retrieved from pg_database and filtered
// by the excludeDatabase config parameter. The tradeoff here is that
@@ -81,21 +90,32 @@ func (c PGDatabaseCollector) Update(ctx context.Context, instance *instance, ch
for rows.Next() {
var datname sql.NullString
if err := rows.Scan(&datname); err != nil {
var connLimit sql.NullInt64
if err := rows.Scan(&datname, &connLimit); err != nil {
return err
}
if !datname.Valid {
continue
}
database := datname.String
// Ignore excluded databases
// Filtering is done here instead of in the query to avoid
// a complicated NOT IN query with a variable number of parameters
if sliceContains(c.excludedDatabases, datname.String) {
if sliceContains(c.excludedDatabases, database) {
continue
}
databases = append(databases, datname.String)
databases = append(databases, database)
connLimitMetric := 0.0
if connLimit.Valid {
connLimitMetric = float64(connLimit.Int64)
}
ch <- prometheus.MustNewConstMetric(
pgDatabaseConnectionLimitsDesc,
prometheus.GaugeValue, connLimitMetric, database,
)
}
// Query the size of the databases
@@ -114,6 +134,7 @@ func (c PGDatabaseCollector) Update(ctx context.Context, instance *instance, ch
pgDatabaseSizeDesc,
prometheus.GaugeValue, sizeMetric, datname,
)
}
return rows.Err()
}