We need a method to limit the amount of analytics data being collected.

This config kept on jenkins.io. It expresses that there are 1000 cohorts, of which 10 are active (1% of the Jenkins server install base).

{
  "cohorts": 1000,
  "activeCohorts": [
    "0-9"
  ]
}

The server will decide based on its server identity if it is enrolled into the range 0-9 or not