Lifecycle labels classify each developer's monthly activity into one of 16 granular states. These roll up into 4 categories used in the summary chart:

Category	Label	Description
First Time	`first time`	First-ever contribution to the ecosystem
Full Time	`full time`	10+ active days, continuing from prior month
	`new full time`	First month reaching 10+ active days
	`part time to full time`	Transitioned from part-time level
	`dormant to full time`	Returned from dormancy at full-time level
Part Time	`part time`	1-9 active days, continuing from prior month
	`new part time`	First month at part-time level
	`full time to part time`	Stepped down from full-time level
	`dormant to part time`	Returned from dormancy at part-time level
Churned / Dormant	`dormant`	No activity this month (previously active)
	`first time to dormant`	Dormant after first contribution
	`part time to dormant`	Dormant after part-time activity
	`full time to dormant`	Dormant after full-time activity
	`churned (after first time)`	Extended inactivity after first contribution
	`churned (after reaching part time)`	Extended inactivity after reaching part time
	`churned (after reaching full time)`	Extended inactivity after reaching full time

Active = First Time + Full Time + Part Time (all 9 labels above the Churned/Dormant group) Churn Ratio = sum(churned + dormant) / sum(active) over the trailing window (12mo or all-time) Metric Definitions

Lifecycle — Developer stage definitions
Activity — Monthly Active Developer (MAD) methodology