Often enough the highest visible overtimes on a city budget are social functions, like a sheriff who provides honorary protective detail to stadiums where they are later bizarrely reimbused through that mechanism.
Below that and down-to the median overtimes usually speak for themselves and draw a fair amount of criticism, but otherwise, the vast combined aggregate under the median points out that we don't pay people enough for the jobs they do, and we can't hire enough of them at that price.