To what extent have the sides of the Donbass war targeted civilians?

The conflict/war in the Donbass - the parts of the Donetsk and Luhansk oblasts of Ukraine in which pro-Russian separatists have declared independence - has cost several thousands of civilian lives; however, reports on various kinds of casualties seem to conflict among sources, and of course there is the question of intent vs. "collateral" damage. Also, I have heard several allegations of intentional targeting of residential areas in Donetsk and perhaps elsewhere by Ukrainian military, several years back (perhaps in 2014).

So, my question is: To what extent / in what ways did the parties in that conflict actually target civilians, over the years?

Note: I'm asking about the period between 2014 and the Russian invasion of Feb 2022.