@Test void toStringContainsOnlySummaryInformation() {
    try (InMemoryStorage storage = InMemoryStorage.newBuilder().build()) {
      assertThat(storage).hasToString("InMemoryStorage{}");
    }
  }
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/src/test/java/zipkin2/storage/InMemoryStorageTest.java