if (subRange.isEmpty()) {
            return emptyIterator();
          }
          final Iterator<RangeMapEntry<K, V>> backingItr =
              entriesByLowerBound
                  .headMap(subRange.upperBound, false)
                  .descendingMap()
                  .values()
                  .iterator();
          return new AbstractIterator<Entry<Range<K>, V>>() {

            @Override

  }

  public void testRowKeyMapHeadMap() {
    sortedTable = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    Map<String, Map<Integer, Character>> map = sortedTable.rowMap().headMap("cat");
    assertEquals(1, map.size());
    assertEquals(ImmutableMap.of(1, 'b'), map.get("bar"));
    map.clear();
    assertTrue(map.isEmpty());
    assertEquals(singleton("foo"), sortedTable.rowKeySet());
  }

          if (subRange.isEmpty()) {
            return emptyIterator();
          }
          final Iterator<RangeMapEntry<K, V>> backingItr =
              entriesByLowerBound
                  .headMap(subRange.upperBound, false)
                  .descendingMap()
                  .values()
                  .iterator();
          return new AbstractIterator<Entry<Range<K>, V>>() {

            @Override

        + override.byName.withProperty('custom.hidden', true),
      ]),
  },

  heatmap: {
    local heatmap = g.panel.heatmap,
    local options = heatmap.options,

    base(title, targets, desc=''):
      heatmap.new(title)
      + heatmap.queryOptions.withTargets(targets)
      + heatmap.queryOptions.withInterval('1m')
      + options.calculation.xBuckets.withMode('size')

            sum(rate(pilot_xds_push_time_bucket{}[1m])) by (le)
          |||
        ) + q.withFormat('heatmap'),

      pushSize:
        self.query(
          '{{le}}',
          |||
            sum(rate(pilot_xds_config_size_bytes_bucket{}[1m])) by (le)
          |||
        ) + q.withFormat('heatmap'),

      pilotEvents: [
        self.query(
          '{{event}} {{type}}',

        |||
      ),
      panels.heatmap.base(
        'Push Time', queries.pushTime, |||
          Count of active and pending proxies managed by each instance.
          Pending is expected to converge to zero.
        |||
      ),
      panels.heatmap.bytes(
        'Push Size', queries.pushSize, |||
          Size of each xDS push.
        |||
      ),

               },
               "expr": "sum(rate(pilot_xds_push_time_bucket{}[1m])) by (le)",
               "format": "heatmap",
               "legendFormat": "{{le}}"
            }
         ],
         "title": "Push Time",
         "type": "heatmap"
      },
      {
         "datasource": {
            "type": "datasource",
            "uid": "-- Mixed --"
         },

                     "legendFormat": "{{cluster}} - {{namespace}}\n"
                  }
               ],
               "title": "Workqueue Waiting Duration Over Time",
               "type": "heatmap"
            },
            {
               "datasource": {
                  "type": "datasource",
                  "uid": "-- Mixed --"
               },
               "fieldConfig": {