Polish "Support filtered scrape for Prometheus"

See gh-21545

spring-boot-project/spring-boot-actuator-autoconfigure/src/docs/asciidoc/endpoints/prometheus.adoc

@@ -6,15 +6,15 @@ The `prometheus` endpoint provides Spring Boot application's metrics in the form
 
 
 [[prometheus-retrieving]]
-== Retrieving the Metrics
+== Retrieving All Metrics
 
-To retrieve the metrics, make a `GET` request to `/actuator/prometheus`, as shown in the following curl-based example:
+To retrieve all metrics, make a `GET` request to `/actuator/prometheus`, as shown in the following curl-based example:
 
-include::{snippets}/prometheus/curl-request.adoc[]
+include::{snippets}/prometheus/all/curl-request.adoc[]
 
 The resulting response is similar to the following:
 
-include::{snippets}/prometheus/http-response.adoc[]
+include::{snippets}/prometheus/all/http-response.adoc[]
 
 
 
@@ -25,4 +25,18 @@ The endpoint uses query parameters to limit the samples that it returns.
 The following table shows the supported query parameters:
 
 [cols="2,4"]
-include::{snippets}/prometheus/request-parameters.adoc[]
+include::{snippets}/prometheus/names/request-parameters.adoc[]
+
+
+
+[[prometheus-retrieving-names]]
+== Retrieving Filtered Metrics
+
+To retrieve metrics matching specific names, make a `GET` request to `/actuator/prometheus` with the `includedNames` query parameter, as shown in the following curl-based example:
+
+include::{snippets}/prometheus/names/curl-request.adoc[]
+
+The resulting response is similar to the following:
+
+include::{snippets}/prometheus/names/http-response.adoc[]
+

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/endpoint/web/documentation/PrometheusScrapeEndpointDocumentationTests.java

@@ -43,7 +43,7 @@ class PrometheusScrapeEndpointDocumentationTests extends MockMvcEndpointDocument
 
 	@Test
 	void prometheus() throws Exception {
-		this.mockMvc.perform(get("/actuator/prometheus")).andExpect(status().isOk()).andDo(document("prometheus"));
+		this.mockMvc.perform(get("/actuator/prometheus")).andExpect(status().isOk()).andDo(document("prometheus/all"));
 	}
 
 	@Test
@@ -52,7 +52,7 @@ class PrometheusScrapeEndpointDocumentationTests extends MockMvcEndpointDocument
 				.perform(get("/actuator/prometheus").param("includedNames",
 						"jvm_memory_used_bytes,jvm_memory_committed_bytes"))
 				.andExpect(status().isOk())
-				.andDo(document("prometheus", requestParameters(parameterWithName("includedNames")
+				.andDo(document("prometheus/names", requestParameters(parameterWithName("includedNames")
 						.description("Restricts the samples to those that match the names. Optional.").optional())));
 	}