diff --git a/doc/configuration/instrumentation.md b/doc/configuration/instrumentation.md
index 91709eee9c3..9f34fa26664 100644
--- a/doc/configuration/instrumentation.md
+++ b/doc/configuration/instrumentation.md
@@ -92,7 +92,7 @@ In case both `prefix` and `env_prefix` are defined, it will be placed before the
 ## Log handler options
 
 ### `instrumentation.log.level`
-* **Syntax:** string, one of `"none"`, `"emergency"`, `"alert"`, `"critical"`, `"error"`, `"warning"`, `"notice"`, `"info"`, `"debug"`, `"all"`.
+* **Syntax:** string, one of `"emergency"`, `"alert"`, `"critical"`, `"error"`, `"warning"`, `"notice"`, `"info"`, `"debug"`, `"all"`.
 * **Default:** `"debug"`
 * **Example:** `loglevel = "error"`
 
@@ -107,10 +107,10 @@ Note that for some events, the level may be different, and this option overridde
 
 ## Example Prometheus configuration
 
-This configuration enables `prometheus`, and `log` handlers:
+This configuration enables `prometheus`, and `log` handlers, setting the periodic measurement (probe) interval to 60 seconds:
 ```toml
 [instrumentation]
-  probe_interval = 10_000
+  probe_interval = 60
 
 [instrumentation.prometheus]
 
diff --git a/doc/migrations/6.2.1_x.x.x.md b/doc/migrations/6.2.1_x.x.x.md
index 08e5e797d15..aac70bc2cc2 100644
--- a/doc/migrations/6.2.1_x.x.x.md
+++ b/doc/migrations/6.2.1_x.x.x.md
@@ -36,9 +36,6 @@ Exometer is no longer configured through [`app.config`](../configuration/configu
 
 Example configuration that is equivalent to the old example configuration provided in `app.config`:
 ```toml
-[instrumentation]
-  probe_interval = 60000
-
 [[instrumentation.exometer.report.graphite]]
   host = "127.0.0.1"
   port = 2003
diff --git a/src/config/mongoose_config_validator.erl b/src/config/mongoose_config_validator.erl
index fd20ceb780a..2286348b5df 100644
--- a/src/config/mongoose_config_validator.erl
+++ b/src/config/mongoose_config_validator.erl
@@ -46,6 +46,7 @@ validate(V, atom, module) -> validate_module(V);
 validate(V, atom, {module, Prefix}) ->
     validate_module(list_to_atom(atom_to_list(Prefix) ++ "_" ++ atom_to_list(V)));
 validate(V, atom, loglevel) -> validate_loglevel(V);
+validate(V, atom, instrumentation_loglevel) -> validate_instrumentation_loglevel(V);
 validate(V, atom, pool_name) -> validate_non_empty_atom(V);
 validate(V, atom, shaper) -> validate_non_empty_atom(V);
 validate(V, atom, access_rule) -> validate_non_empty_atom(V);
@@ -64,6 +65,12 @@ validate_section([_|_], non_empty) -> ok;
 validate_section(L, any) when is_list(L) -> ok.
 
 %% validators
+%% 
+validate_instrumentation_loglevel(none) ->
+    error(#{what => validate_instrumentation_loglevel_failed,
+            value => none});
+validate_instrumentation_loglevel(Level) ->
+    validate_loglevel(Level).
 
 validate_loglevel(Level) ->
     mongoose_logs:loglevel_keyword_to_number(Level).
diff --git a/src/instrument/mongoose_instrument_log.erl b/src/instrument/mongoose_instrument_log.erl
index 13ef08f5318..754f3f35b8b 100644
--- a/src/instrument/mongoose_instrument_log.erl
+++ b/src/instrument/mongoose_instrument_log.erl
@@ -9,7 +9,7 @@
 
 -spec config_spec() -> mongoose_config_spec:config_section().
 config_spec() ->
-    #section{items = #{<<"level">> => #option{type = atom, validate = loglevel}},
+    #section{items = #{<<"level">> => #option{type = atom, validate = instrumentation_loglevel}},
              defaults = #{<<"level">> => debug}}.
 
 -spec set_up(mongoose_instrument:event_name(), mongoose_instrument:labels(),
diff --git a/test/config_parser_SUITE.erl b/test/config_parser_SUITE.erl
index 77f1171ae19..f9bfe4ae7de 100644
--- a/test/config_parser_SUITE.erl
+++ b/test/config_parser_SUITE.erl
@@ -2961,6 +2961,7 @@ instrumentation_log(_Config) ->
     T = fun(Opts) -> #{<<"instrumentation">> => #{<<"log">> => Opts}} end,
     ?cfg(P, default_config(P), T(#{})),
     ?cfg(P ++ [level], info, T(#{<<"level">> => <<"info">>})),
+    ?err(T(#{<<"level">> => <<"none">>})),
     ?err(T(#{<<"level">> => <<"insane">>})).
 
 instrumentation_exometer(_Config) ->