Unique Message ID properties in APIGEE X

[darpanjain420]

I want an unique message id in apigee x and i can see the request already has following headers:
x-apigee-message-id
x-apigee-tracking-id

x-request-id

Can anyone please explain as to which of these are getting created by APIGEE X and are unique for every API call?
Also which is suggested to use as unique id for api call?

[ganadurai · Accepted solution]

x-apigee-message-id is the global uniqueId created by Apigee X platform. 

https://cloud.google.com/apigee/docs/api-platform/reference/variables-reference#messageid

Thanks