Deployment frequency
How often your team ships to production. More, smaller deploys usually means less risk in each deploy.
Why it matters to an engineering manager
More, smaller deploys usually means less risk in each one. The number is only useful next to change failure rate. Shipping often and breaking often is not a win.
Which tools measure this
Tools tagged DORA. A tag means the vendor's pages listed it. It does not mean every sub-metric is broken out.