private Response get(String path) throws IOException {
    return client.newCall(new Request.Builder().url(url(server, path)).build()).execute();
  }
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