As the title says, how do you know which secrets and credentials of your production services were used, and by whom/what?

The context of the question is https://devops.stackexchange.com/questions/3658/secrets-management.

As the title says, how do you know which secrets and credentials of your production services were used, and by whom/what?

As the title says, how do you know which secrets and credentials of your production services were used, and by whom/what?
Thanks

As the title says, how do you know which secrets and credentials of your production services were used, and by whom/what?