How do I access the full debug log for an managed email service Messaging.InboundEmailHandler?

Question

I have a Messaging.InboundEmailHandler class that is packaged and distributed as part of a managed package. It is then configured against an Email Service in subscriber orgs.

How can I access the full debug log for the EmailToApexHandler operations when the email arrives?

I'm aware of the question Salesforce Email Service Debugging and have logged in via the LMA subscriber support login as the context user that is configured against the email address.

The EmailToApexHandler log entries are appearing as expected in the debug log, but any logging content that is generated by the managed class is hidden behind

ENTERING_MANAGED_PKG|Namesapce

entries. Typically the way around this is to use the LMA subscriber support login, but that doesn't seem to be working in the case of email services.

Answer 1

Given issue occurred a lot of times before in my experience.

Based on my observations, if User Trace Flags were created before someone logs in as LMA subscriber support login, then debug logs will not contain logs message content from managed package.

In order to obtain logs, it is necessary to delete existing User Trace Flag, and recreate new one.

P.S. There is another serious conclusion, based on same set of observations. Given logs are visible to same user even if he does not log in from LMA (so just as regular user). And logs from managed package still will be saved and shown to the traced user (if he has permissions to see logs), even if user from LMA logs out, so before logging out from LMA it is wise to delete User Trace Flags and all debug logs.