Document the process info contribution

Closes gh-45567

Author: philwebb

spring-boot-project/spring-boot-actuator-autoconfigure/src/docs/antora/modules/api/pages/rest/actuator/info.adoc

@@ -56,3 +56,13 @@ The following table describes the structure of the `os` section of the response:
 
 [cols="2,1,3"]
 include::partial$rest/actuator/info/response-fields-beneath-os.adoc[]
+
+
+
+[[info.retrieving.response-structure.process]]
+==== Process Response Structure
+
+The following table describes the structure of the `process` section of the response:
+
+[cols="2,1,3"]
+include::partial$rest/actuator/info/response-fields-beneath-process.adoc[]

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/info/InfoEndpointDocumentationTests.java

@@ -28,6 +28,7 @@
 import org.springframework.boot.actuate.info.InfoContributor;
 import org.springframework.boot.actuate.info.InfoEndpoint;
 import org.springframework.boot.actuate.info.OsInfoContributor;
+import org.springframework.boot.actuate.info.ProcessInfoContributor;
 import org.springframework.boot.info.BuildProperties;
 import org.springframework.boot.info.GitProperties;
 import org.springframework.context.annotation.Bean;
@@ -54,7 +55,7 @@ class InfoEndpointDocumentationTests extends MockMvcEndpointDocumentationTests {
 	void info() throws Exception {
 		this.mockMvc.perform(get("/actuator/info"))
 			.andExpect(status().isOk())
-			.andDo(MockMvcRestDocumentation.document("info", gitInfo(), buildInfo(), osInfo()));
+			.andDo(MockMvcRestDocumentation.document("info", gitInfo(), buildInfo(), osInfo(), processInfo()));
 	}
 
 	private ResponseFieldsSnippet gitInfo() {
@@ -90,6 +91,15 @@ private FieldDescriptor osInfoField(String field, String desc) {
 			.optional();
 	}
 
+	private ResponseFieldsSnippet processInfo() {
+		return responseFields(beneathPath("process"),
+				fieldWithPath("pid").description("Process ID.").type(JsonFieldType.NUMBER),
+				fieldWithPath("parentPid").description("Parent Process ID (or -1).").type(JsonFieldType.NUMBER),
+				fieldWithPath("owner").description("Process owner.").type(JsonFieldType.STRING),
+				fieldWithPath("cpus").description("Number of CPUs available to the process.")
+					.type(JsonFieldType.NUMBER));
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	static class TestConfiguration {
 
@@ -124,6 +134,11 @@ OsInfoContributor osInfoContributor() {
 			return new OsInfoContributor();
 		}
 
+		@Bean
+		ProcessInfoContributor processInfoContributor() {
+			return new ProcessInfoContributor();
+		}
+
 	}
 
 }