A KPI is a key performance indicator.  For content, KPIs are a way to measure important metrics or values for your content.  But, since this is about looking at content, the metrics are about the effectiveness of the content itself.

Here are some KPIs for different content types

  • Blog posts
    • Pageviews
    • Organic sessions
  • Video
    • Subscriptions
    • Views
  • Podcasts
    • Ranking
    • Downloads

Read more at https://www.digitalmarketer.com/blog/content-marketing/