Configurable tombstone function name

[scheb]

Idea

Currently the tombstone function name is hardcoded to tombstone (a function within the global scope). Make that function configurable and allow having multiple tombstone functions. Multiple tombstone functions would provide more flexibility, e.g.

• You don't want a function in the global scope, but use something namespaced instead
• Have a function that always logs invocations vs. have a function that randomly logs (sampling)
• Use different tombstones for different purposes

If this idea would be useful to you, give it a +1

Todo

• Add function name to Tombstone class
• Log tombstone function name
• Add analyzer config option for tombstone functions names, pass these to the extractor
• Add analyzer config option to use tombstone function name for matching tombstones (or not, to treat all tombstone functions as if they're all the same function)

[scheb]

Feature released with v1.3.0.