Add gRPC observability: logging, metrics, recovery interceptors

internal/indexer/service.go

@@ -24,11 +24,16 @@ func NewIndexerService(cfg config.Config) (*IndexerService, error) {
 }
 
 func (service *IndexerService) Search(req *pb.SearchRequest) (*pb.SearchResponse, error) {
+	log.Trace().Str("query", req.GetQuery()).Msg("fetching results from indexer")
+
 	searchResult, err := service.indexer.Search(req.GetQuery(), req.GetLimit(), req.GetTracker())
 	if err != nil {
-		log.Error().Err(err).Msg("Failed to search in indexer")
+		log.Error().Err(err).Msg("failed to search in indexer")
 		return nil, err
 	}
+
+	log.Trace().Int("raw_items", len(searchResult.Items)).Msg("indexer returned results, converting to proto")
+
 	return searchResult.ToProto(), nil
 }