Progress markers
The Progress markers are five separate metrics that count sessions whose playhead crossed each of five fixed thresholds (10%, 25%, 50%, 75%, and 95% of the content length). Use them to chart drop-off across the content runtime; pair with Content starts to compute the share of started sessions that reached each milestone.
Each marker fires once per session and is not retriggered on seek-back. Skipped markers when seeking forward are not counted (for example, a viewer who jumps from 5% to 60% triggers the 10%, 25%, and 50% markers all at once).
How each marker is calculated
The media backend evaluates the reported playhead against Content length after each event. When the playhead first crosses a threshold, the corresponding mediaReporting.sessionDetails.hasProgress* boolean is set to true for the rest of the session. All five markers are reported on the close call.
10% progress marker progress-10
Fires when the playhead first reaches 10% of Content length.
a.media.progress10 when Media Core is enabled.25% progress marker progress-25
Fires when the playhead first reaches 25% of Content length.
a.media.progress25 when Media Core is enabled.50% progress marker progress-50
Fires when the playhead first reaches 50% of Content length.
a.media.progress50 when Media Core is enabled.75% progress marker progress-75
Fires when the playhead first reaches 75% of Content length.
a.media.progress75 when Media Core is enabled.95% progress marker progress-95
Fires when the playhead first reaches 95% of Content length.
a.media.progress95 when Media Core is enabled.