Logger is nil for API. Fixes #4577 (#4583)

Signed-off-by: Goutham Veeramachaneni <gouthamve@gmail.com>

web/api/v1/api.go

@@ -166,6 +166,7 @@ func NewAPI(
 		enableAdmin:     enableAdmin,
 		rulesRetriever:  rr,
 		remoteReadLimit: remoteReadLimit,
+		logger:          logger,
 	}
 }