I am creating some alert monitors and need to fill a particular hole: I need to know when a particular transaction log backup actually breaks the restore chain. Knowing this will allow me to create a monitor that ignores trn backup failures that do not break the restore chain, since I already have a monitor that alerts me based on the number of successful tlog backups in a given hour, I need to know immediately when any given backup failure breaks the restore chain.
My tlogs backup every 15 minutes, so minor failures every now and then that do not break the chain are not as critical, but a broken chain requires immediate action. Is there a list of failure result types that do and do not break the restore chain? This would be a tremendous help. With this info I could know at a glance that my restore capability remains intact even if a network or other hiccup causes a tlog backup to fail.