diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index fd1ef8d45..528b0003f 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -15,6 +15,8 @@ The following tip changes can be tested by building VictoriaMetrics components f
 
 ## v1.79.x long-time support release (LTS)
 
+* SECURITY: serve `/robots.txt` content to disallow indexing of the exposed instances by search engines. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4128) for details.
+
 ## [v1.79.12](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.79.12)
 
 Released at 2023-04-06
diff --git a/lib/httpserver/httpserver.go b/lib/httpserver/httpserver.go
index 43f8bc49f..7a219348a 100644
--- a/lib/httpserver/httpserver.go
+++ b/lib/httpserver/httpserver.go
@@ -316,6 +316,11 @@ func handlerWrapper(s *server, w http.ResponseWriter, r *http.Request, rh Reques
 		// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1833
 		fmt.Fprintf(w, "VictoriaMetrics is Ready.\n")
 		return
+	case "/robots.txt":
+		// This prevents search engines from indexing contents
+		// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4128
+		fmt.Fprintf(w, "User-agent: *\nDisallow: /\n")
+		return
 	default:
 		if strings.HasPrefix(r.URL.Path, "/debug/pprof/") {
 			pprofRequests.Inc()