enable input metrics

Signed-off-by: Shizuo Fujita <[email protected]>

Author: Watson1978

deployment/command-line-option.md

@@ -37,7 +37,7 @@ Usage: fluentd [options]
         --use-v1-config              Use v1 configuration format (default)
         --use-v0-config              Use v0 configuration format
         --strict-config-value        Parse config values strictly
-        --enable-input-metrics       Enable input plugin metrics on fluentd
+        --enable-input-metrics       [DEPRECATED] Enable input plugin metrics on fluentd
         --enable-size-metrics        Enable plugin record size metrics on fluentd
     -v, --verbose                    increase verbose level (-v: debug, -vv: trace)
     -q, --quiet                      decrease verbose level (-q: warn, -qq: error)

deployment/system-config.md

@@ -250,6 +250,8 @@ Please see also [Log Rotation Setting](logging.md#log-rotation-setting).
 
 Specifies whether measuring input metrics should be enabled or not.
 
+Deprecated parameter. Since v1.19.0, this parameter is always enabled.
+
 #### `enable_size_metrics`
 
 | type | default | version |