Update doc/user/metrics/README.md

Co-Authored-By: LiliC <cosiclili@gmail.com>

Author: joelanford

doc/user/metrics/README.md

@@ -6,7 +6,7 @@
 
 The `func ExposeMetricsPort(ctx context.Context, port int32) (*v1.Service, error)` is a helper function that exposes general metrics about the running program. These metrics are inherited from controller-runtime. The metrics are by default served on `:8383/metrics`. A [Service][service] object is created with the metrics port exposed, which can be then accessed by Prometheus. The Service object is [garbage collected][gc] by the owner, which is determined based on the pods owner in which the leader is running in.
 
-To modify the port the metrics are exposed on, change the variable `metricsHost string = ":8383"` variable in the `cmd/manager/main.go` file of the generated operator.
+By default, the metrics are served on `0.0.0.0:8383/metrics`. To modify the port the metrics are exposed on, change the `var metricsPort int32 = 8383` variable in the `cmd/manager/main.go` file of the generated operator.
 
 ### Usage: