Adds deprecation notice for logging.timezone

src/core/server/config/deprecation/core_deprecations.test.ts

@@ -298,4 +298,24 @@ describe('core deprecations', () => {
       expect(messages).toEqual([]);
     });
   });
+
+  describe('logging.timezone', () => {
+    it('warns when ops events are used', () => {
+      const { messages } = applyCoreDeprecations({
+        logging: { timezone: 'GMT' },
+      });
+      expect(messages).toMatchInlineSnapshot(`
+        Array [
+          "\\"logging.timezone\\" has been deprecated and will be removed in 8.0. To set the timezone moving forward, please add a timezone date modifier to the log pattern in your logging configuration. For more details, see https://github.com/elastic/kibana/blob/master/src/core/server/logging/README.md",
+        ]
+      `);
+    });
+
+    it('does not warn when other events are configured', () => {
+      const { messages } = applyCoreDeprecations({
+        logging: { events: { log: '*' } },
+      });
+      expect(messages).toEqual([]);
+    });
+  });
 });

src/core/server/config/deprecation/core_deprecations.ts

@@ -127,6 +127,18 @@ const requestLoggingEventDeprecation: ConfigDeprecation = (settings, fromPath, l
   return settings;
 };
 
+const timezoneLoggingDeprecation: ConfigDeprecation = (settings, fromPath, log) => {
+  if (has(settings, 'logging.timezone')) {
+    log(
+      '"logging.timezone" has been deprecated and will be removed ' +
+        'in 8.0. To set the timezone moving forward, please add a timezone date modifier to the log pattern ' +
+        'in your logging configuration. For more details, see ' +
+        'https://github.com/elastic/kibana/blob/master/src/core/server/logging/README.md'
+    );
+  }
+  return settings;
+};
+
 export const coreDeprecationProvider: ConfigDeprecationProvider = ({ rename, unusedFromRoot }) => [
   unusedFromRoot('savedObjects.indexCheckTimeout'),
   unusedFromRoot('server.xsrf.token'),
@@ -163,4 +175,5 @@ export const coreDeprecationProvider: ConfigDeprecationProvider = ({ rename, unu
   mapManifestServiceUrlDeprecation,
   opsLoggingEventDeprecation,
   requestLoggingEventDeprecation,
+  timezoneLoggingDeprecation,
 ];