TimedPhase only supports Nanoseconds.

--The start time is encoded in nanoseconds, and doing unit conversions
sounds like more work than I want to do, or is likely to be needed. So
while `TimedPhase` can be queried for its unit (so that `RequestLog`
doesn't have to worry about it), the unit has to be nanoseconds

fili-core/src/main/java/com/yahoo/bard/webservice/logging/TimedPhase.java

@@ -16,29 +16,17 @@ public class TimedPhase implements AutoCloseable {
     private static final Logger LOG = LoggerFactory.getLogger(TimedPhase.class);
 
     private final String name;
-    private final TimeUnit unit;
     private long start;
     private long duration;
 
     /**
      * Constructor.
-     *
-     * @param name  Name of the phase
-     * @param unit  The timer's units
-     */
-    public TimedPhase(String name, TimeUnit unit) {
-        this.name = name;
-        this.unit = unit;
-    }
-
-    /**
-     * Constructor.
-     * Times in nanoseconds.
+     * Times are in nanoseconds.
      *
      * @param name  Name of the phase
      */
     public TimedPhase(String name) {
-        this(name, TimeUnit.NANOSECONDS);
+        this.name = name;
     }
 
     /**
@@ -74,7 +62,7 @@ public String getName() {
     }
 
     public TimeUnit getUnit() {
-        return unit;
+        return TimeUnit.NANOSECONDS;
     }
 
     public boolean isStarted() {