Adjust GcpLayout JSON to latest format

log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/GcpLayoutTest.java

@@ -21,11 +21,6 @@
 import static org.apache.logging.log4j.layout.template.json.TestHelpers.usingSerializedLogEventAccessor;
 import static org.assertj.core.api.Assertions.assertThat;
 
-import java.time.Instant;
-import java.time.ZoneId;
-import java.time.ZonedDateTime;
-import java.time.format.DateTimeFormatter;
-import java.util.Locale;
 import org.apache.logging.log4j.Level;
 import org.apache.logging.log4j.core.LogEvent;
 import org.apache.logging.log4j.core.impl.ContextDataFactory;
@@ -44,9 +39,6 @@ class GcpLayoutTest {
 
     private static final int LOG_EVENT_COUNT = 1_000;
 
-    private static final DateTimeFormatter DATE_TIME_FORMATTER =
-            DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
-
     @Test
     void test_lite_log_events() {
         LogEventFixture.createLiteLogEvents(LOG_EVENT_COUNT).forEach(GcpLayoutTest::verifySerialization);
@@ -84,8 +76,9 @@ private static void verifySerialization(final LogEvent logEvent) {
         usingSerializedLogEventAccessor(LAYOUT, logEvent, accessor -> {
 
             // Verify timestamp.
-            final String expectedTimestamp = formatLogEventInstant(logEvent);
-            assertThat(accessor.getString("timestamp")).isEqualTo(expectedTimestamp);
+            final org.apache.logging.log4j.core.time.Instant instant = logEvent.getInstant();
+            assertThat(accessor.getInteger("timestampSeconds")).isEqualTo(instant.getEpochSecond());
+            assertThat(accessor.getInteger("timestampNanos")).isEqualTo(instant.getNanoOfSecond());
 
             // Verify severity.
             final Level level = logEvent.getLevel();
@@ -148,48 +141,25 @@ private static void verifySerialization(final LogEvent logEvent) {
                         .isEmpty();
             }
 
-            // Verify insert id.
-            assertThat(accessor.getString("logging.googleapis.com/insertId")).matches("[-]?[0-9]+");
-
             // Verify exception.
             if (exception != null) {
 
-                // Verify exception class.
-                assertThat(accessor.getString(new String[] {"_exception", "class"}))
-                        .isEqualTo(exception.getClass().getCanonicalName());
-
-                // Verify exception message.
-                assertThat(accessor.getString(new String[] {"_exception", "message"}))
-                        .isEqualTo(exception.getMessage());
-
                 // Verify exception stack trace.
-                assertThat(accessor.getString(new String[] {"_exception", "stackTrace"}))
+                assertThat(accessor.getString("exception"))
                         .contains(exception.getLocalizedMessage())
                         .contains("at org.apache.logging.log4j.layout.template.json")
                         .contains("at " + JAVA_BASE_PREFIX + "java.lang.reflect.Method")
                         .contains("at org.junit.platform.engine");
 
             } else {
-                assertThat(accessor.getObject(new String[] {"_exception", "class"}))
-                        .isNull();
-                assertThat(accessor.getObject(new String[] {"_exception", "message"}))
-                        .isNull();
-                assertThat(accessor.getString(new String[] {"_exception", "stackTrace"}))
-                        .isEmpty();
+                assertThat(accessor.getString("exception")).isNull();
             }
 
             // Verify thread name.
-            assertThat(accessor.getString("_thread")).isEqualTo(logEvent.getThreadName());
+            assertThat(accessor.getString("thread")).isEqualTo(logEvent.getThreadName());
 
             // Verify logger name.
-            assertThat(accessor.getString("_logger")).isEqualTo(logEvent.getLoggerName());
+            assertThat(accessor.getString("logger")).isEqualTo(logEvent.getLoggerName());
         });
     }
-
-    private static String formatLogEventInstant(final LogEvent logEvent) {
-        final org.apache.logging.log4j.core.time.Instant instant = logEvent.getInstant();
-        final ZonedDateTime dateTime = Instant.ofEpochSecond(instant.getEpochSecond(), instant.getNanoOfSecond())
-                .atZone(ZoneId.of("UTC"));
-        return DATE_TIME_FORMATTER.format(dateTime);
-    }
 }

log4j-layout-template-json/src/main/resources/GcpLayout.json

@@ -1,10 +1,15 @@
 {
-  "timestamp": {
+  "timestampSeconds": {
     "$resolver": "timestamp",
-    "pattern": {
-      "format": "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'",
-      "timeZone": "UTC",
-      "locale": "en_US"
+    "epoch": {
+      "unit": "secs",
+      "rounded": true
+    }
+  },
+  "timestampNanos": {
+    "$resolver": "timestamp",
+    "epoch": {
+      "unit": "secs.nanos"
     }
   },
   "severity": {
@@ -36,10 +41,6 @@
       "stackTraceEnabled": false
     }
   },
-  "logging.googleapis.com/insertId": {
-    "$resolver": "counter",
-    "stringified": true
-  },
   "logging.googleapis.com/trace": {
     "$resolver": "mdc",
     "key": "trace_id"
@@ -49,25 +50,18 @@
     "key": "span_id"
   },
   "logging.googleapis.com/trace_sampled": true,
-  "_exception": {
-    "class": {
-      "$resolver": "exception",
-      "field": "className"
-    },
-    "message": {
-      "$resolver": "exception",
-      "field": "message"
-    },
+  "exception": {
+    "$resolver": "exception",
+    "field": "stackTrace",
     "stackTrace": {
-      "$resolver": "pattern",
-      "pattern": "%xEx"
+      "stringified": true
     }
   },
-  "_thread": {
+  "thread": {
     "$resolver": "thread",
     "field": "name"
   },
-  "_logger": {
+  "logger": {
     "$resolver": "logger",
     "field": "name"
   }

src/changelog/.2.x.x/3586_improve_GcpLayout.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<entry xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xmlns="https://logging.apache.org/xml/ns"
+       xsi:schemaLocation="https://logging.apache.org/xml/ns https://logging.apache.org/xml/ns/log4j-changelog-0.xsd"
+       type="changed">
+  <issue id="3586" link="https://github.com/apache/logging-log4j2/pull/3586"/>
+  <description format="asciidoc">
+    Update `GcpLayout.json` JSON Template Layout event template to support automatic timestamp recognition by the Google Cloud Logging. This also changes `exception`, `thread`, `logger` fields, and removes `insertId` field.
+  </description>
+</entry>