It would be helpful to us to know when a checkin includes a pending merge link. There is no way to get at this information in the trigger, but in our case it is quite fundamental.

We need to have a way to force integrators to not be able to merge in there own code, since that provides a single point of failure. They can merge in each others code, or their developers' code, but not their own.

In our particular case another solution would be a before-merge trigger (which does not exist) so that we could deny them the ability to merge in the first place. (This is not quite as good since perhaps resolving the merge conflicts would be helpful for them if there are any)