@Test void delegatesCheck() {
    StorageComponent mock = mock(StorageComponent.class);

    new ThrottledStorageComponent(mock, registry, tracing, 1, 2, 1).check();
    verify(mock, times(1)).check();
  }
The {@code toString()} of {@link Component} implementations appear in health check endpoints.
Since these are likely to be exposed in logs and other monitoring tools, care should be taken
to ensure {@code toString()} output is a reasonable length and does not contain sensitive
information.
zipkin-server/src/test/java/zipkin2/server/internal/throttle/ThrottledStorageComponentTest.java