PagerDuty has raised $10.7 million from Andreessen Horowitz to build out an IT alert service that is modeled on what Amazon Web Services developed to manage its massive infrastructure. The funding will go toward building additional services to give IT managers a way to quantify how staff is responding to alerts and develop new mobile apps for notifications. A Y Combinator startup, PagerDuty raised a $1.9 million seed round in 2010 from angel investors.