diff --git a/README.md b/README.md
index 70f49ced..235f036f 100644
--- a/README.md
+++ b/README.md
@@ -351,7 +351,11 @@ Then fill just created **ergw.config** file with content like described below pr
            {[<<"APN1">>], [{vrf, sgi}]}
           ]},
 
-         {teid, {3, 6}}, % {teid, {Prefix, Length}}
+         {teid, {3, 6}}, % {teid, {Prefix, Length}} - optional, default: {0, 0}
+
+         {metrics, [
+             {gtp_path_rtt_millisecond_intervals, [10, 100]} % optional, default: [10, 30, 50, 75, 100, 1000, 2000]
+         ]},
 
          {node_selection,
           [{default,
diff --git a/config/ergw-c-node.config b/config/ergw-c-node.config
index 2cd45a46..776cd1ef 100644
--- a/config/ergw-c-node.config
+++ b/config/ergw-c-node.config
@@ -59,6 +59,7 @@
 	  ]},
 
 	 %% {teid, {3, 6}}, % {teid, {Prefix, Length}}
+	 %% {metrics, [{gtp_path_rtt_millisecond_intervals, [10, 30, 50, 75, 100, 1000, 2000]}]},
 
 	 {node_selection,
 	  [{default,
diff --git a/src/ergw_config.erl b/src/ergw_config.erl
index 69d73e9a..6a403f8b 100644
--- a/src/ergw_config.erl
+++ b/src/ergw_config.erl
@@ -35,7 +35,8 @@
 			 {nodes, []},
 			 {ip_pools, []},
 			 {apns, []},
-			 {charging, [{default, []}]}]).
+			 {charging, [{default, []}]},
+			 {metrics, []}]).
 -define(VrfDefaults, [{features, invalid}]).
 -define(ApnDefaults, [{ip_pools, []},
 		      {bearer_type, 'IPv4v6'},
@@ -79,7 +80,8 @@ load_env_config([{Key, Value} | T])
        Key =:= charging;
        Key =:= proxy_map;
        Key =:= teid;
-       Key =:= node_id ->
+       Key =:= node_id;
+       Key =:= metrics ->
     ok = application:set_env(ergw, Key, Value),
     load_env_config(T);
 load_env_config([_ | T]) ->
@@ -272,6 +274,8 @@ validate_option(path_management, Opts) when ?is_opts(Opts) ->
     gtp_path:validate_options(Opts);
 validate_option(teid, Value) ->
     ergw_tei_mngr:validate_option(Value);
+validate_option(metrics, Opts) ->
+    ergw_prometheus:validate_options(Opts);
 validate_option(Opt, Value)
   when Opt == plmn_id;
        Opt == node_id;
diff --git a/src/ergw_prometheus.erl b/src/ergw_prometheus.erl
index 06052657..1f2fbeea 100644
--- a/src/ergw_prometheus.erl
+++ b/src/ergw_prometheus.erl
@@ -7,6 +7,8 @@
 
 -module(ergw_prometheus).
 
+-export([validate_options/1]).
+
 -export([declare/0]).
 -export([gtp_error/3, gtp/4, gtp/5,
 	 gtp_request_duration/4,
@@ -22,11 +24,31 @@
 -include_lib("gtplib/include/gtp_packet.hrl").
 -include_lib("pfcplib/include/pfcp_packet.hrl").
 
+%%%===================================================================
+%%% Options Validation
+%%%===================================================================
+
+-define(DefaultMetricsOpts, [{gtp_path_rtt_millisecond_intervals, [10, 30, 50, 75, 100, 1000, 2000]}]).
+
+validate_options(Opts) ->
+    ergw_config:validate_options(fun validate_option/2, Opts, ?DefaultMetricsOpts, map).
+
+validate_option(gtp_path_rtt_millisecond_intervals = Opt, Value) ->
+    case [V || V <- Value, is_integer(V), V > 0] of
+        [_|_] = Value ->
+            Value;
+        _ ->
+            throw({error, {options, {Opt, Value}}})
+    end.
+
 %%%===================================================================
 %%% API
 %%%===================================================================
 
 declare() ->
+    %% Metrics Config
+    {ok, Config} = application:get_env(ergw, metrics),
+
     %% GTP path metrics
     prometheus_counter:declare([{name, gtp_path_messages_processed_total},
 				{labels, [name, remote, direction, version, type]},
@@ -45,7 +67,7 @@ declare() ->
 				{help, "Total number of reply GTP message on path"}]),
     prometheus_histogram:declare([{name, gtp_path_rtt_milliseconds},
 				  {labels, [name, ip, version, type]},
-				  {buckets, [10, 30, 50, 75, 100, 1000, 2000]},
+				  {buckets, maps:get(gtp_path_rtt_millisecond_intervals, Config)},
 				  {help, "GTP path round trip time"}]),
     prometheus_gauge:declare([{name, gtp_path_contexts_total},
 			      {labels, [name, ip, version]},
diff --git a/test/config_SUITE.erl b/test/config_SUITE.erl
index 10365243..1f2dc5d5 100644
--- a/test/config_SUITE.erl
+++ b/test/config_SUITE.erl
@@ -920,6 +920,10 @@ config(_Config)  ->
     ?error_option(set_cfg_value([nodes, default, request], [{timeout, invalid}], ?GGSN_CONFIG)),
     ?ok_option(set_cfg_value([nodes, default, request], [{timeout, 30000}, {retry, 5}], ?GGSN_CONFIG)),
 
+    ?error_option(set_cfg_value([metrics, gtp_path_rtt_millisecond_intervals], [invalid], ?GGSN_CONFIG)),
+    ?error_option(set_cfg_value([metrics, gtp_path_rtt_millisecond_intervals], [-100], ?GGSN_CONFIG)),
+    ?ok_option(set_cfg_value([metrics, gtp_path_rtt_millisecond_intervals], [10, 100], ?GGSN_CONFIG)),
+
     ?error_option(set_cfg_value([nodes, test], [], ?GGSN_PROXY_CONFIG)),
     ?ok_option(set_cfg_value([nodes, "test"], [], ?GGSN_PROXY_CONFIG)),
     ?ok_option(set_cfg_value([nodes, "test", vrfs, cp, features], ['CP-Function'], ?GGSN_PROXY_CONFIG)),