"options": {
                "match": "null",
                "result": {
                  "text": "N/A"
                }
              },
              "type": "special"
            }
          ],
          "thresholds": {
            "mode": "absolute",
            "steps": [
              {
                "color": "green",
                "value": null
              },
              {

              "options": {
                "match": "null",
                "result": {
                  "text": "N/A"
                }
              },
              "type": "special"
            }
          ],
          "thresholds": {
            "mode": "absolute",
            "steps": [
              {
                "color": "green",
                "value": null
              },
              {

    ListenableFuture<?> nullFuture = immediateFuture(null);
    ListenableFuture<?> transformedFuture = transform(nullFuture, constant(null), directExecutor());
    assertNull(getDone(transformedFuture));
  }

  @J2ktIncompatible // TODO(b/324550390): Enable
  public void testTransform_genericsHierarchy() throws Exception {
    ListenableFuture<FooChild> future = immediateFuture(null);
    final BarChild barChild = new BarChild();

    ListenableFuture<?> nullFuture = immediateFuture(null);
    ListenableFuture<?> transformedFuture = transform(nullFuture, constant(null), directExecutor());
    assertNull(getDone(transformedFuture));
  }

  @J2ktIncompatible // TODO(b/324550390): Enable
  public void testTransform_genericsHierarchy() throws Exception {
    ListenableFuture<FooChild> future = immediateFuture(null);
    final BarChild barChild = new BarChild();

				// all attempts to compare values with null are caught by the type checker at compilation time
				"self.unsetPlainStr == null":     "no matching overload for '_==_' applied to '(string, null)",
				"self.unsetDefaultedStr != null": "no matching overload for '_!=_' applied to '(string, null)",

	}
	return n.Time, nil
}

// Null represents a value that may be null.
// Null implements the [Scanner] interface so
// it can be used as a scan destination:
//
//	var s Null[string]
//	err := db.QueryRow("SELECT name FROM foo WHERE id=?", id).Scan(&s)
//	...
//	if s.Valid {
//	   // use s.V
//	} else {
//	   // NULL value
//	}
type Null[T any] struct {
	V     T
	Valid bool
}

    return try {
      val response = call.execute()
      val bodyString = response.body.string()
      RecordedResponse(request, response, null, bodyString, null)
    } catch (e: IOException) {
      RecordedResponse(request, null, null, null, e)
    }
  }

  /**
   * Tests that use this will fail unless boot classpath is set. Ex. `-Xbootclasspath/p:/tmp/alpn-boot-8.0.0.v20140317`
   */

	spec := nullTestSpec{"nullstring", "string", [6]nullTestRow{
		{Null[string]{"aqua", true}, "", Null[string]{"aqua", true}},
		{Null[string]{"brown", false}, "", Null[string]{"", false}},
		{"chartreuse", "", Null[string]{"chartreuse", true}},
		{Null[string]{"darkred", true}, "", Null[string]{"darkred", true}},
		{Null[string]{"eel", false}, "", Null[string]{"", false}},
		{"foo", Null[string]{"black", false}, nil},
	}}
	nullTestRun(t, spec)

        failure.assertHasCause("Execution failed for ToNullTransform: ${file("a.jar").absolutePath}.")
        failure.assertHasCause("path may not be null or empty string. path='null'")

        where:
        method << ['dir', 'file']
    }

    def "user gets a reasonable error message when transform returns a non-existing file"() {
        given:

		Type:      gaugeMetric,
	}
}

func getRepFailedOperationsLastMinuteMD(namespace MetricNamespace) MetricDescription {
	return MetricDescription{
		Namespace: namespace,
		Subsystem: replicationSubsystem,
		Name:      lastMinFailedCount,
		Help:      "Total number of objects which failed replication in the last full minute",
		Type:      gaugeMetric,
	}
}