fix: resource detection for 2nd gen of Cloud Functions works incorrectly (#1045)

* fix: resource detection for 2nd gen of Cloud Functions works incorrectly

* Add a test

Author: losalex

google-cloud-logging/src/main/java/com/google/cloud/logging/MonitoredResourceUtil.java

@@ -169,6 +169,10 @@ private static Resource detectResourceType() {
       return Resource.Global;
     }
 
+    if (getter.getEnv("FUNCTION_SIGNATURE_TYPE") != null
+        && getter.getEnv("FUNCTION_TARGET") != null) {
+      return Resource.CloudFunction;
+    }
     if (getter.getEnv("K_SERVICE") != null
         && getter.getEnv("K_REVISION") != null
         && getter.getEnv("K_CONFIGURATION") != null) {
@@ -179,10 +183,6 @@ private static Resource detectResourceType() {
         && getter.getEnv("GAE_VERSION") != null) {
       return Resource.AppEngine;
     }
-    if (getter.getEnv("FUNCTION_SIGNATURE_TYPE") != null
-        && getter.getEnv("FUNCTION_TARGET") != null) {
-      return Resource.CloudFunction;
-    }
     if (getter.getAttribute("instance/attributes/cluster-name") != null) {
       return Resource.K8sContainer;
     }

google-cloud-logging/src/test/java/com/google/cloud/logging/MonitoredResourceUtilTest.java

@@ -243,6 +243,10 @@ public void testResourceTypeCloudFunction() {
     expect(getterMock.getEnv("FUNCTION_SIGNATURE_TYPE")).andReturn(MOCKED_NON_EMPTY).once();
     expect(getterMock.getEnv("FUNCTION_TARGET")).andReturn(MOCKED_NON_EMPTY).once();
     expect(getterMock.getEnv("K_SERVICE")).andReturn(MockedFunctionName).anyTimes();
+    expect(getterMock.getEnv("K_REVISION")).andReturn(MockedFunctionName + ".1").anyTimes();
+    expect(getterMock.getEnv("K_CONFIGURATION"))
+        .andReturn(MockedFunctionName + "-config")
+        .anyTimes();
     expect(getterMock.getEnv(anyString())).andReturn(null).anyTimes();
     replay(getterMock);
     // exercise