'Used to store call info.
:request_id: used to identity a request
:api: api name
:seq: sequence number
:client: client name
:server: server name
:status: request status
:start: start timestamp
:end: end timestamp
:annotation: application-level key-value datas'

def __init__(self, request_id, api, seq, client, server, status, start, end, annotation, meta):

    self.request_id = request_id
    self.api = api
    self.seq = seq
    self.client = client
    self.server = server
    self.status = status
    self.start = start
    self.end = end
    self.annotation = annotation
    self.meta = meta
