@Override
  public int hashCode() {
    int h = 1;
    h *= 1000003;
    h ^= (int) (h ^ ((timestamp >>> 32) ^ timestamp));
    h *= 1000003;
    h ^= value.hashCode();
    h *= 1000003;
    h ^= endpoint == null ? 0 : endpoint.hashCode();
    return h;
  }
The host that reported this annotation or null if unknown.

<p>In v2 format, this is analogous to {@link Span#localEndpoint()}.
zipkin/src/main/java/zipkin2/v1/V1Annotation.java