Additional metric for account fetch failed case

src/main/java/org/prebid/server/auction/requestfactory/Ortb2RequestFactory.java

@@ -424,6 +424,7 @@ private Future<Account> accountFallback(Throwable exception,
         if (exception instanceof PreBidException) {
             UNKNOWN_ACCOUNT_LOGGER.warn(accountErrorMessage(exception.getMessage(), httpRequest), 100);
         } else {
+            metrics.updateAccountRequestRejectedByFailedFetch(accountId);
             logger.warn("Error occurred while fetching account: {0}", exception.getMessage());
             logger.debug("Error occurred while fetching account", exception);
         }

src/main/java/org/prebid/server/metric/MetricName.java

@@ -119,6 +119,7 @@ public enum MetricName {
     rejected_by_invalid_account("rejected.invalid-account"),
     rejected_by_invalid_stored_impr("rejected.invalid-stored-impr"),
     rejected_by_invalid_stored_request("rejected.invalid-stored-request"),
+    rejected_by_account_fetch_failed("rejected.account-fetch-failed"),
 
     // currency rates
     stale,

src/main/java/org/prebid/server/metric/Metrics.java

@@ -258,6 +258,10 @@ public void updateAccountRequestRejectedByInvalidStoredRequestMetrics(String acc
         updateAccountRequestsMetrics(accountId, MetricName.rejected_by_invalid_stored_request);
     }
 
+    public void updateAccountRequestRejectedByFailedFetch(String accountId) {
+        updateAccountRequestsMetrics(accountId, MetricName.rejected_by_account_fetch_failed);
+    }
+
     private void updateAccountRequestsMetrics(String accountId, MetricName metricName) {
         forAccount(accountId).requests().incCounter(metricName);
     }

src/test/java/org/prebid/server/auction/requestfactory/Ortb2RequestFactoryTest.java

@@ -553,6 +553,7 @@ public void fetchAccountShouldReturnEmptyAccountIfExceptionOccurred() {
                 AuctionContext.builder().bidRequest(bidRequest).build());
 
         // then
+        verify(metrics).updateAccountRequestRejectedByFailedFetch(accountId);
         verify(applicationSettings).getAccountById(eq(accountId), any());
 
         assertThat(result.result()).isEqualTo(Account.empty(accountId));

src/test/java/org/prebid/server/metric/MetricsTest.java

@@ -1411,6 +1411,16 @@ public void shouldIncrementUpdateAccountActivityProcessedRulesCount() {
                 .isEqualTo(1);
     }
 
+    @Test
+    public void shouldIncrementUpdateAccountRequestRejectedByFailedFetchCount() {
+        // when
+        metrics.updateAccountRequestRejectedByFailedFetch("account_id");
+
+        // then
+        assertThat(metricRegistry.counter("account.account_id.requests.rejected.account-fetch-failed").getCount())
+                .isEqualTo(1);
+    }
+
     private void verifyCreatesConfiguredCounterType(Consumer<Metrics> metricsConsumer) {
         final EnumMap<CounterType, Class<? extends Metric>> counterTypeClasses = new EnumMap<>(CounterType.class);
         counterTypeClasses.put(CounterType.counter, Counter.class);