feat: add routes to enable Log Patterns, Fields, and Labels in Grafana (#905)

* Add patterns path

* add detected_labels, detected_field, and detected_fields paths

* Update api/logs/v1/http.go

Co-authored-by: Joao Marcal <jmarcal@redhat.com>

* Add patterns, detected_labels, detected_field, detected_fields routes

---------

Co-authored-by: Joao Marcal <jmarcal@redhat.com>

Author: btaani

api/logs/v1/http.go

@@ -35,6 +35,10 @@ const (
 	rulesPerGroupNameRoute = "/loki/api/v1/rules/{namespace}/{groupName}"
 	volumeRoute            = "/loki/api/v1/index/volume"
 	volumeRangeRoute       = "/loki/api/v1/index/volume_range"
+	patternsRoute          = "/loki/api/v1/patterns"
+	detectedLabelsRoute    = "/loki/api/v1/detected_labels"
+	detectedFieldRoute     = "/loki/api/v1/detected_field"
+	detectedFieldsRoute    = "/loki/api/v1/detected_fields"
 
 	otlpRoute = "/otlp/v1/logs"
 	pushRoute = "/loki/api/v1/push"
@@ -229,6 +233,22 @@ func NewHandler(read, tail, write, rules *url.URL, rulesReadOnly bool, tlsOption
 				prometheus.Labels{"group": "logsv1", "handler": "series"},
 				proxyRead,
 			))
+			r.Handle(patternsRoute, c.instrument.NewHandler(
+				prometheus.Labels{"group": "logsv1", "handler": "patterns"},
+				proxyRead,
+			))
+			r.Handle(detectedLabelsRoute, c.instrument.NewHandler(
+				prometheus.Labels{"group": "logsv1", "handler": "detected_labels"},
+				proxyRead,
+			))
+			r.Handle(detectedFieldRoute, c.instrument.NewHandler(
+				prometheus.Labels{"group": "logsv1", "handler": "detected_field"},
+				proxyRead,
+			))
+			r.Handle(detectedFieldsRoute, c.instrument.NewHandler(
+				prometheus.Labels{"group": "logsv1", "handler": "detected_fields"},
+				proxyRead,
+			))
 		})
 	}