Can anyone explain what is "requestorIdentity" in PegaRULES-SecurityEvent.log?

It looks like a Timestamp, what its purpose?

Is the value remaining unchanged until the user logout?

Is it possible that 2 user session may share the same value of requestorIdentity?

{"id":"d3abd9f4-a5b2-4dc8-9488-50e7760a1e5a","eventCategory":"Authentication event","eventType":"Operator record change","appName":"PoCPE8","tenantID":"shared","ipAddress":" Proprietary information hidden","timeStamp":"木 2019 6 13, 01:27:37:454","operatorID":"myemailaddress","nodeID":"aad9b90ff809da4ea77be1009e8b477a","requestorIdentity":"20190611T013206","operatorRecID":"DATA-ADMIN-OPERATOR-ID emailaddress","operatorRecName":"chunzhi.hong","operation":"update"}
{"id":"d7077f2d-77d0-4710-887b-ea3de86e47c5","eventCategory":"Authentication event","eventType":"Operator record change","appName":"PoCPE8","tenantID":"shared","ipAddress":" Proprietary information hidden","timeStamp":"木 2019 6 13, 01:29:02:648","operatorID":"myemailaddress","nodeID":"aad9b90ff809da4ea77be1009e8b477a","requestorIdentity":"20190613T004924","operatorRecID":"DATA-ADMIN-OPERATOR-ID myemailaddress","operatorRecName":"chunzhi.hong","operation":"update"}
{"id":"3bd39d89-6b51-4500-8e3d-2a6d68e8e529","eventCategory":"Data access event","eventType":"Search","appName":"PoCPE8","tenantID":"shared","ipAddress":" Proprietary information hidden","timeStamp":"木 2019 6 13, 02:43:52:430","operatorID":"myemailaddress","nodeID":"aad9b90ff809da4ea77be1009e8b477a","outcome":"Success","requestorIdentity":"20190613T012748","searchString":"Assign","indexType":"Rule","resultCount":"50"}

***Edited by Moderator: Lochan to mask proprietary information***