@Override
  public void toData(DataOutput out,
      SerializationContext context) throws IOException {
    if (suspectRequests != null) {
      out.writeInt(suspectRequests.size());
      for (SuspectRequest<ID> sr : suspectRequests) {
        context.getSerializer().writeObject(sr.getSuspectMember(), out);
        StaticSerialization.writeString(sr.getReason(), out);
      }
    } else {
      out.writeInt(0);
    }
  }
The HealthMonitor will send SuspectMembersMessages to inform other members of the cluster
that a member may have crashed. No response is required.
geode-membership/src/main/java/org/apache/geode/distributed/internal/membership/gms/messages/SuspectMembersMessage.java