code: public void project_serviceName_instance_instanceId_snapshot_POST(String serviceName, String instanceId, String snapshotName) throws IOException {
  		String qPath = "/cloud/project/{serviceName}/instance/{instanceId}/snapshot";
  		StringBuilder sb = path(qPath, serviceName, instanceId);
  		HashMap<String, Object>o = new HashMap<String, Object>();
  		addBody(o, "snapshotName", snapshotName);
  		exec(qPath, "POST", sb.toString(), o);
  	}
docs: Snapshot an instance
  
  REST: POST /cloud/project/{serviceName}/instance/{instanceId}/snapshot
  @param instanceId [required] Instance id
  @param serviceName [required] Service name
  @param snapshotName [required] Snapshot name