docs: update metrics api path

conf/defaults.ini

@@ -432,7 +432,7 @@ enabled = true
 execute_alerts = true
 
 #################################### Internal Grafana Metrics ############
-# Metrics available at HTTP API Url /api/metrics
+# Metrics available at HTTP API Url /metrics
 [metrics]
 enabled           = true
 interval_seconds  = 10

conf/sample.ini

@@ -375,7 +375,7 @@ log_queries =
 ;execute_alerts = true
 
 #################################### Internal Grafana Metrics ##########################
-# Metrics available at HTTP API Url /api/metrics
+# Metrics available at HTTP API Url /metrics
 [metrics]
 # Disable / Enable internal metrics
 ;enabled           = true

docs/sources/installation/configuration.md

@@ -676,7 +676,7 @@ Ex `filters = sqlstore:debug`
 ## [metrics]
 
 ### enabled
-Enable metrics reporting. defaults true. Available via HTTP API `/api/metrics`.
+Enable metrics reporting. defaults true. Available via HTTP API `/metrics`.
 
 ### interval_seconds