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string group = 1
string key = 2
string type = 3
string operation = 4
map<string, string> extData = 5
string category = 6
bytes data = 1
string errMsg = 2
bool success = 3
repeated bytes datalist = 4
map<string, string> dataMap = 5
string msgId = 1
string firstTopic = 2
string originTopic = 3
int64 offset = 4
int64 nextOffset = 5
int32 retry = 6
bool retained = 7
bool isEmpty = 8
bytes payload = 9
int64 bornTimestamp = 10
int64 storeTimestamp = 11
int32 ack = 12
map<string, string> userProperties = 13
string group = 1
string key = 2
bytes data = 3
string type = 4
string operation = 5
map<string, string> extData = 6
string category = 7