@Test void jvmMetrics_prometheus() throws Exception {
    assertThat(scrape())
        .contains("jvm_memory_max_bytes")
        .contains("jvm_memory_used_bytes")
        .contains("jvm_memory_committed_bytes")
        .contains("jvm_buffer_count_buffers")
        .contains("jvm_buffer_memory_used_bytes")
        .contains("jvm_buffer_total_capacity_bytes")
        .contains("jvm_classes_loaded_classes")
        .contains("jvm_classes_unloaded_classes_total")
        .contains("jvm_threads_live_threads")
        .contains("jvm_threads_states_threads")
        .contains("jvm_threads_peak_threads")
        .contains("jvm_threads_daemon_threads");
    // gc metrics are not tested as are not present during test running
  }
Only add tests that do not consider the value of a counter or gauge, as these will flake and so
should only exist in {@link ITZipkinMetricsDirty}.
zipkin-server/src/test/java/zipkin2/server/internal/prometheus/ITZipkinMetrics.java