Add catch all error code for metrics

api/src/main/java/datawave/microservice/querymetric/BaseQueryMetric.java

@@ -685,6 +685,7 @@ public int getFieldNumber(String name) {
     protected Set<Prediction> predictions = new HashSet<>();
 
     public static final String DATAWAVE = "DATAWAVE";
+    public static final String DEFAULT_ERROR_CODE = "500-1";
     protected static final Map<String,String> discoveredVersionMap = BaseQueryMetric.getVersionsFromClasspath();
     protected long numUpdates = 0;
 
@@ -938,12 +939,32 @@ public void addPrediction(Prediction prediction) {
         this.predictions.add(prediction);
     }
 
+    /**
+     * Sets the error code and error message of the metric. There are a few cases that can occur: <br>
+     * <br>
+     * <u>The throwable cause <b>IS</b> an instance of {@link QueryException}:</u>
+     * <ul>
+     * <li>In this case, the error message and error code will be set to the values that were passed when the exception was thrown.</li>
+     * <li>If the error code happens to be blank, {@link BaseQueryMetric#DEFAULT_ERROR_CODE} will be used.</li>
+     * </ul>
+     * <br>
+     * <u>The throwable cause <b>IS NOT</b> an instance of {@link QueryException}:</u>
+     * <ul>
+     * <li>In this case, there is no error code given by the exception, so the error code will be set to {@link BaseQueryMetric#DEFAULT_ERROR_CODE}.</li>
+     * <li>The error message is set to the message passed by either the cause of the throwable (if it is not null) or the throwable itself.</li>
+     * </ul>
+     * <em>All possible error codes can be found here {@link datawave.webservice.query.exception.DatawaveErrorCode}.</em>
+     *
+     * @param t
+     *            Object containing the exception associated with the error.
+     */
     public void setError(Throwable t) {
         if (t.getCause() instanceof QueryException) {
             QueryException qe = (QueryException) t.getCause();
-            this.setErrorCode(qe.getErrorCode());
+            this.setErrorCode(qe.getErrorCode() != null ? qe.getErrorCode() : DEFAULT_ERROR_CODE);
             this.setErrorMessage(qe.getMessage());
         } else {
+            this.setErrorCode(DEFAULT_ERROR_CODE);
             this.setErrorMessage(t.getCause() != null ? t.getCause().getMessage() : t.getMessage());
         }
     }

api/src/test/java/datawave/microservice/querymetric/QueryMetricTest.java

@@ -46,6 +46,7 @@ public class QueryMetricTest {
     private static ArrayList<PageMetric> pageTimes = null;
     private static List<String> positiveSelectors = null;
     private static List<String> proxyServers = null;
+    private static final String DEFAULT_ERROR_CODE = "500-1";
 
     @BeforeAll
     public static void setup() {
@@ -78,7 +79,7 @@ public void testSetError() {
         Throwable t = new Throwable("non-datawave error");
         queryMetric.setError(t);
         assertEquals("non-datawave error", queryMetric.getErrorMessage());
-        assertEquals("", queryMetric.getErrorCode());
+        assertEquals(DEFAULT_ERROR_CODE, queryMetric.getErrorCode());
     }
 
     @Test