# of pull requests by non-employees

There is no single metric that can define the health of a community. KPIs will vary based on the business and target user. Below are some metrics we find helpful for calibrating general community health.

Open source communities:

% of code contributed by non-employees

# of members leaving the community

% of comments from new community members by cohort

# of at mentions by month

Average number of attendees per event over time

# of retweets by month