[receiver/nginx] use generated status header

This PR updates the component to generate the status table using mdatagen. Questions to the code owners:

Does this component require any of the standard warnings? See list: https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/standard-warnings.md

See related issue: open-telemetry#19172

Signed-off-by: Alex Boten <aboten@lightstep.com>

receiver/nginxreceiver/README.md

@@ -1,10 +1,14 @@
 # Nginx Receiver
 
-| Status                   |           |
-| ------------------------ |-----------|
-| Stability                | [beta]    |
-| Supported pipeline types | metrics   |
-| Distributions            | [contrib] |
+<!-- status autogenerated section -->
+| Status        |           |
+| ------------- |-----------|
+| Stability     | [beta]: metrics   |
+| Distributions | [contrib] |
+
+[beta]: https://github.com/open-telemetry/opentelemetry-collector#beta
+[contrib]: https://github.com/open-telemetry/opentelemetry-collector-releases/tree/main/distributions/otelcol-contrib
+<!-- end autogenerated section -->
 
 This receiver can fetch stats from a Nginx instance using a mod_status endpoint.
 
@@ -46,6 +50,3 @@ receivers:
 
 The full list of settings exposed for this receiver are documented [here](./config.go)
 with detailed sample configurations [here](./testdata/config.yaml).
-
-[beta]:https://github.com/open-telemetry/opentelemetry-collector#beta
-[contrib]:https://github.com/open-telemetry/opentelemetry-collector-releases/tree/main/distributions/otelcol-contrib

receiver/nginxreceiver/factory.go

@@ -28,16 +28,15 @@ import (
 )
 
 const (
-	typeStr   = "nginx"
-	stability = component.StabilityLevelBeta
+	typeStr = "nginx"
 )
 
 // NewFactory creates a factory for nginx receiver.
 func NewFactory() receiver.Factory {
 	return receiver.NewFactory(
 		typeStr,
 		createDefaultConfig,
-		receiver.WithMetrics(createMetricsReceiver, stability))
+		receiver.WithMetrics(createMetricsReceiver, metadata.MetricsStability))
 }
 
 func createDefaultConfig() component.Config {

receiver/nginxreceiver/metadata.yaml

@@ -1,5 +1,11 @@
 type: nginxreceiver
 
+status:
+  class: receiver
+  stability:
+    beta: [metrics]
+  distributions: [contrib]
+
 attributes:
   state:
     description: The state of a connection