diff --git a/internal/postprocessor/config.go b/internal/postprocessor/config.go
index a2d4121ff2d..a44652ef445 100644
--- a/internal/postprocessor/config.go
+++ b/internal/postprocessor/config.go
@@ -47,16 +47,22 @@ type libraryInfo struct {
 	ServiceConfig string
 	// RelPath is the relative path to the client from the repo root.
 	RelPath string
+	// ReleaseLevel is an override for the release level of a library. It is
+	// used in cases where a release level can't be determined by looking at
+	// the import path and/or reading service `doc.go` files because there are
+	// no associated services.
+	ReleaseLevel string
 }
 
 func (p *postProcessor) loadConfig() error {
 	var postProcessorConfig struct {
 		Modules        []string `yaml:"modules"`
 		ServiceConfigs []*struct {
-			InputDirectory string `yaml:"input-directory"`
-			ServiceConfig  string `yaml:"service-config"`
-			ImportPath     string `yaml:"import-path"`
-			RelPath        string `yaml:"rel-path"`
+			InputDirectory       string `yaml:"input-directory"`
+			ServiceConfig        string `yaml:"service-config"`
+			ImportPath           string `yaml:"import-path"`
+			RelPath              string `yaml:"rel-path"`
+			ReleaseLevelOverride string `yaml:"release-level-override"`
 		} `yaml:"service-configs"`
 		ManualClients []*ManifestEntry `yaml:"manual-clients"`
 	}
diff --git a/internal/postprocessor/config.yaml b/internal/postprocessor/config.yaml
index 4350baf98e2..3b9ca08b2db 100644
--- a/internal/postprocessor/config.yaml
+++ b/internal/postprocessor/config.yaml
@@ -306,6 +306,7 @@ service-configs:
   - input-directory: google/cloud/alloydb/connectors/v1
     service-config: connectors_v1.yaml
     import-path: cloud.google.com/go/alloydb/connectors/apiv1
+    release-level-override: preview
   - input-directory: google/cloud/alloydb/connectors/v1alpha
     service-config: connectors_v1alpha.yaml
     import-path: cloud.google.com/go/alloydb/connectors/apiv1alpha
diff --git a/internal/postprocessor/manifest.go b/internal/postprocessor/manifest.go
index a6cb509155f..3c5c739f2ac 100644
--- a/internal/postprocessor/manifest.go
+++ b/internal/postprocessor/manifest.go
@@ -63,11 +63,11 @@ func (p *postProcessor) Manifest() (map[string]ManifestEntry, error) {
 	for _, manual := range p.config.ManualClientInfo {
 		entries[manual.DistributionName] = *manual
 	}
-	for inputDir, conf := range p.config.GoogleapisToImportPath {
-		if conf.ServiceConfig == "" {
+	for inputDir, li := range p.config.GoogleapisToImportPath {
+		if li.ServiceConfig == "" {
 			continue
 		}
-		yamlPath := filepath.Join(p.googleapisDir, inputDir, conf.ServiceConfig)
+		yamlPath := filepath.Join(p.googleapisDir, inputDir, li.ServiceConfig)
 		yamlFile, err := os.Open(yamlPath)
 		if err != nil {
 			return nil, err
@@ -79,11 +79,12 @@ func (p *postProcessor) Manifest() (map[string]ManifestEntry, error) {
 		if err := yaml.NewDecoder(yamlFile).Decode(&yamlConfig); err != nil {
 			return nil, fmt.Errorf("decode: %v", err)
 		}
-		docURL, err := docURL(p.googleCloudDir, conf.ImportPath, conf.RelPath)
+		docURL, err := docURL(p.googleCloudDir, li.ImportPath, li.RelPath)
 		if err != nil {
 			return nil, fmt.Errorf("unable to build docs URL: %v", err)
 		}
-		releaseLevel, err := releaseLevel(p.googleCloudDir, conf.ImportPath, conf.RelPath)
+
+		releaseLevel, err := releaseLevel(p.googleCloudDir, li)
 		if err != nil {
 			return nil, fmt.Errorf("unable to calculate release level for %v: %v", inputDir, err)
 		}
@@ -95,7 +96,7 @@ func (p *postProcessor) Manifest() (map[string]ManifestEntry, error) {
 
 		entry := ManifestEntry{
 			APIShortname:        apiShortname,
-			DistributionName:    conf.ImportPath,
+			DistributionName:    li.ImportPath,
 			Description:         yamlConfig.Title,
 			Language:            "go",
 			ClientLibraryType:   "generated",
@@ -103,7 +104,7 @@ func (p *postProcessor) Manifest() (map[string]ManifestEntry, error) {
 			ReleaseLevel:        releaseLevel,
 			LibraryType:         gapicAutoLibraryType,
 		}
-		entries[conf.ImportPath] = entry
+		entries[li.ImportPath] = entry
 	}
 	// Remove base module entry
 	delete(entries, "")
@@ -132,9 +133,12 @@ func docURL(cloudDir, importPath, relPath string) (string, error) {
 	return "https://cloud.google.com/go/docs/reference/" + mod + "/latest/" + pkgPath, nil
 }
 
-func releaseLevel(cloudDir, importPath, relPath string) (string, error) {
-	i := strings.LastIndex(importPath, "/")
-	lastElm := importPath[i+1:]
+func releaseLevel(cloudDir string, li *libraryInfo) (string, error) {
+	if li.ReleaseLevel != "" {
+		return li.ReleaseLevel, nil
+	}
+	i := strings.LastIndex(li.ImportPath, "/")
+	lastElm := li.ImportPath[i+1:]
 	if strings.Contains(lastElm, "alpha") {
 		return "preview", nil
 	} else if strings.Contains(lastElm, "beta") {
@@ -142,7 +146,7 @@ func releaseLevel(cloudDir, importPath, relPath string) (string, error) {
 	}
 
 	// Determine by scanning doc.go for our beta disclaimer
-	docFile := filepath.Join(cloudDir, relPath, "doc.go")
+	docFile := filepath.Join(cloudDir, li.RelPath, "doc.go")
 	f, err := os.Open(docFile)
 	if err != nil {
 		return "", err