well, currently, it just send alert message, no recovery messages, no there nothing to filter 
I like to have a few alerte message when problem happens, but also some reminder next days, without spamming myself too much.
I use telegram to get the alert message, it's a trade-off between :
- not missing a message in the flow: I have other messages and commands in the same telegram chat, so I could miss a single alert message.
- but also not warning too often. Sometime I know something is wrong, but don't have time to repair for some days.
But your posts are good ideas, I can try different things
I also have solution to make it work as I want (one data rate limit per messages) : the point was mostly to understand better how the rate limit works...pushing my knowledge bundaries a bit more and play around with nodered 
