How do you evaluate and measure your performance as an engineering manager?

Since most people rate then selves as better than average, I'm better than average.  But seriously, i have tried to apply becoming a better software manger by applying the same  process  to becoming a better software developer, find others who are good at the role determine behaviours that make them good, any processes that hey follow that lead to success, read books recommended by the industry , try to apply the techniques and ask feedback from directs on how I am doing, its a journey where I can always get better, looking back on previous directs i can see them progressing through their careers i would hope that my time as a manager influenced them, also past projects I have delivered as a team woudl indicate I must have been doing something right as the teams delivered