Clean up autoDiscoverDatabases in the new collector

Signed-off-by: Joe Adams <github@joeadams.io>

cmd/postgres_exporter/main.go

@@ -119,7 +119,6 @@ func main() {
 		logger,
 		dsn,
 		[]string{},
-		collector.WithAutoDiscoverDatabases(*autoDiscoverDatabases),
 	)
 	if err != nil {
 		level.Error(logger).Log("msg", "Failed to create PostgresCollector", "err", err.Error())

collector/collector.go

@@ -87,10 +87,6 @@ type PostgresCollector struct {
 	logger     log.Logger
 
 	servers map[string]*server
-
-	// autoDiscoverDatabases will cause the collector to query the database
-	// to find other servers and also scrape them.
-	autoDiscoverDatabases bool
 }
 
 type Option func(*PostgresCollector) error
@@ -146,12 +142,6 @@ func NewPostgresCollector(logger log.Logger, dsns []string, filters []string, op
 		if err != nil {
 			return nil, err
 		}
-		// Manually provided servers are always classified as "primary"
-		s.isPrimary = true
-
-		// TODO(@sysadmind): We need to discover the downstream servers and add them here.
-		// if p.autoDiscoverDatabases {
-		// }
 
 		servers[dsn] = s
 	}
@@ -161,13 +151,6 @@ func NewPostgresCollector(logger log.Logger, dsns []string, filters []string, op
 	return p, nil
 }
 
-func WithAutoDiscoverDatabases(discover bool) Option {
-	return func(p *PostgresCollector) error {
-		p.autoDiscoverDatabases = discover
-		return nil
-	}
-}
-
 // Describe implements the prometheus.Collector interface.
 func (p PostgresCollector) Describe(ch chan<- *prometheus.Desc) {
 	ch <- scrapeDurationDesc

collector/server.go

@@ -22,10 +22,9 @@ import (
 )
 
 type server struct {
-	dsn       string
-	name      string
-	db        *sql.DB
-	isPrimary bool // Certain queries are only run on the primary server
+	dsn  string
+	name string
+	db   *sql.DB
 }
 
 func makeServer(dsn string) (*server, error) {