add error group info

Author: tbradellis

.idea/codeStyles/Project.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="PYTHON_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/codeStyles/codeStyleConfig.xml

@@ -624,6 +624,34 @@ The following APIs provide additional functionality, such as setting app server
         When inside a transaction, the last call to `noticeError` wins. Only 1 error will be reported per transaction.
       </td>
     </tr>
+##here
+
+    <tr>
+      <td>
+         Classes that implement the [`ErrorGroupCallback`](https://newrelic.github.io/java-agent-api/javadoc/index.html?com/newrelic/api/agent/NewRelic.html) interface are used to generate grouping keys for errors that will be sent to
+         New Relic.  These keys will be used to group error messages in the Errors Inbox UI.
+      </td>
+
+      <td>
+        [`public interface ErrorGroupCallback {
+              String generateGroupingString(ErrorData errorData);
+          }`](https://newrelic.github.io/java-agent-api/javadoc/index.html?com/newrelic/api/agent/NewRelic.html)
+
+      </td>
+    </tr>
+    <tr>
+      <td>
+        To register an [`ErrorGroupCallback`](https://newrelic.github.io/java-agent-api/javadoc/index.html?com/newrelic/api/agent/NewRelic.html) that's used to generate a grouping key for the supplied
+        error.
+
+      </td>
+
+      <td>
+        [`NewRelic.setErrorGroupCallback(errorGroupCallback)`](https://newrelic.github.io/java-agent-api/javadoc/index.html?com/newrelic/api/agent/NewRelic.html)
+
+      </td>
+    </tr>
+
 
     <tr>
       <td>