Allow disabling duty cycle trackers

artio-core/src/main/java/uk/co/real_logic/artio/FixCounters.java

@@ -159,6 +159,11 @@ public AtomicCounter negativeTimestamps()
 
     public DutyCycleTracker getFramerDutyCycleTracker(final long threshold)
     {
+        if (threshold == 0)
+        {
+            return new DutyCycleTracker();
+        }
+
         return new DutyCycleStallTracker(
             newCounter(FRAMER_MAX_CYCLE_TIME_TYPE_ID.id(), "framer max cycle time in ns"),
             newCounter(FRAMER_CYCLE_TIME_THRESHOLD_EXCEEDED_TYPE_ID.id(),
@@ -169,6 +174,11 @@ public DutyCycleTracker getFramerDutyCycleTracker(final long threshold)
 
     public DutyCycleTracker getIndexerDutyCycleTracker(final long threshold)
     {
+        if (threshold == 0)
+        {
+            return new DutyCycleTracker();
+        }
+
         return new DutyCycleStallTracker(
             newCounter(INDEXER_MAX_CYCLE_TIME_TYPE_ID.id(), "indexer max cycle time in ns"),
             newCounter(INDEXER_CYCLE_TIME_THRESHOLD_EXCEEDED_TYPE_ID.id(),
@@ -179,6 +189,11 @@ public DutyCycleTracker getIndexerDutyCycleTracker(final long threshold)
 
     public DutyCycleTracker getLibraryDutyCycleTracker(final int libraryId, final long threshold)
     {
+        if (threshold == 0)
+        {
+            return new DutyCycleTracker();
+        }
+
         return new DutyCycleStallTracker(
             newCounter(LIBRARY_MAX_CYCLE_TIME_TYPE_ID.id(), "library " + libraryId + " max cycle time in ns"),
             newCounter(LIBRARY_CYCLE_TIME_THRESHOLD_EXCEEDED_TYPE_ID.id(),

artio-core/src/main/java/uk/co/real_logic/artio/engine/EngineConfiguration.java

@@ -1300,7 +1300,7 @@ public EngineConfiguration cancelOnDisconnectTimeoutWindowInMs(final int cancelO
      * Set a threshold for the framer work cycle time which when exceeded it will increment the
      * framer cycle time exceeded count.
      *
-     * @param framerCycleThresholdNs value in nanoseconds
+     * @param framerCycleThresholdNs value in nanoseconds. The value 0 will disable duty cycle tracking on the framer.
      * @return this for fluent API.
      */
     public EngineConfiguration framerCycleThresholdNs(final long framerCycleThresholdNs)
@@ -1313,7 +1313,7 @@ public EngineConfiguration framerCycleThresholdNs(final long framerCycleThreshol
      * Set a threshold for the indexer work cycle time which when exceeded it will increment the
      * indexer cycle time exceeded count.
      *
-     * @param indexerCycleThresholdNs value in nanoseconds
+     * @param indexerCycleThresholdNs value in nanoseconds. The value 0 will disable duty cycle tracking on the indexer.
      * @return this for fluent API.
      */
     public EngineConfiguration indexerCycleThresholdNs(final long indexerCycleThresholdNs)

artio-core/src/main/java/uk/co/real_logic/artio/library/LibraryConfiguration.java

@@ -292,7 +292,7 @@ public LibraryConfiguration reproduceInbound(
      * Set a threshold for the library work cycle time which when exceeded it will increment the
      * library cycle time exceeded count.
      *
-     * @param libraryCycleThresholdNs value in nanoseconds
+     * @param libraryCycleThresholdNs value in nanoseconds. The value 0 will disable duty cycle tracking on the library.
      * @return this for fluent API.
      */
     public LibraryConfiguration libraryCycleThresholdNs(final long libraryCycleThresholdNs)