feat: add globbing support to collector refs in config

README.md

@@ -137,13 +137,18 @@ target:
   data_source_name: 'sqlserver://prom_user:prom_password@dbserver1.example.com:1433'
 
   # Collectors (referenced by name) to execute on the target.
-  collectors: [pricing_data_freshness]
+  # Glob patterns are supported (see <https://pkg.go.dev/path/filepath#Match> for syntax).
+  collectors: [pricing_data_freshness, pricing_*]
 
 # Collector definition files.
+# Glob patterns are supported (see <https://pkg.go.dev/path/filepath#Match> for syntax).
 collector_files:
   - "*.collector.yml"
 ```
 
+**NOTE:** The `collectors` and `collector_files` configurations support [Glob pattern matching](https://pkg.go.dev/path/filepath#Match).
+To match names with literal pattern terms in them, e.g. `collector_*1*`, these must be escaped: `collector_\*1\*`.
+
 ### Collectors
 
 Collectors may be defined inline, in the exporter configuration file, under `collectors`, or they may be defined in

config/config.go

@@ -558,13 +558,22 @@ func checkCollectorRefs(collectorRefs []string, ctx string) error {
 func resolveCollectorRefs(
 	collectorRefs []string, collectors map[string]*CollectorConfig, ctx string,
 ) ([]*CollectorConfig, error) {
-	resolved := make([]*CollectorConfig, 0, len(collectorRefs))
+	found := make(map[*CollectorConfig]bool)
 	for _, cref := range collectorRefs {
-		c, found := collectors[cref]
-		if !found {
-			return nil, fmt.Errorf("unknown collector %q referenced in %s", cref, ctx)
+		for k, c := range collectors {
+			matched, err := filepath.Match(cref, k)
+			if err != nil {
+				return nil, fmt.Errorf("bad collector %q referenced in %s: %w", cref, ctx, err)
+			}
+			if !matched {
+				return nil, fmt.Errorf("unknown collector %q referenced in %s", cref, ctx)
+			}
+			found[c] = true
 		}
-		resolved = append(resolved, c)
+	}
+	resolved := make([]*CollectorConfig, 0, len(found))
+	for k := range found {
+		resolved = append(resolved, k)
 	}
 	return resolved, nil
 }

examples/sql_exporter.yml

@@ -21,8 +21,10 @@ target:
   data_source_name: 'sqlserver://prom_user:prom_password@dbserver1.example.com:1433'
 
   # Collectors (referenced by name) to execute on the target.
-  collectors: [mssql_standard]
+  # Glob patterns are supported (see <https://pkg.go.dev/path/filepath#Match> for syntax).
+  collectors: [mssql_*]
 
 # Collector files specifies a list of globs. One collector definition is read from each matching file.
+# Glob patterns are supported (see <https://pkg.go.dev/path/filepath#Match> for syntax).
 collector_files: 
   - "*.collector.yml"