@Override
  public boolean equals(Object o) {
    if (o == this) return true;
    if (!(o instanceof V1Annotation)) return false;
    V1Annotation that = (V1Annotation) o;
    return timestamp == that.timestamp
        && value.equals(that.value)
        && Objects.equals(endpoint, that.endpoint);
  }
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