Clarification on Janna's Monsoon (channeled spells)

I've been a long time Janna player, ever since I started playing League, and ironically, I don't know how a lot of other spells interact with Monsoon, or I suppose channeled spells in general.

I am mainly confused as to what the general rules are for which spells/item actives disrupt channeled spells. As Janna, I often have Locket/Mikael's/Talisman, and of course Exhaust and Eye of the Storm.

Now... which one of those will cancel Monsoon if used in the middle... is there a pattern? This has been one of the most confusing parts of playing Janna to me. I've cancelled my ult many times on accident by shielding allies during my ult, despite Eye of the Storm not having any casting animation (which is why it confuses me so often). However, I have successfully used Locket during ult channels before, so does that mean as an item active, Mikael's would not disrupt the channel?

I feel like it might be as simple as champion abilities will cancel channels, but item actives/summoner spells will not.