best practice for unbound logs with logrotate

[ѽ҉ᶬḳ℠]

Got logrotate for managing the recycling of various os and userland 
logs, however the unbound generated logs are running somehow "wild" - as 
in exceeding the size constrain of the current log (as set in the 
logrotate conf). Also unbound logs that been rotated to pasture, pending 
shredding, just keep on bloating in size.

Have tried various settings in logroate but none seems to able to tame 
the unbound logs.

Anyone with a similar usecase who would not mind sharing some good 
practice for unbound logs with logrotate?