@Test void toStringContainsOnlySummaryInformation() {
    DataSource datasource = mock(DataSource.class);
    when(datasource.toString()).thenReturn("Blamo");

    assertThat(storage(datasource)).hasToString("MySQLStorage{datasource=Blamo}");
  }
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-storage/mysql-v1/src/test/java/zipkin2/storage/mysql/v1/MySQLStorageTest.java