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"That looks like the wireless timeline." (Thx to Gerald for identifying)
There is an open Bugzilla tracking issues with it.
It seems to be very picky about the capture contents. Flashes the status bar yellow but message not visible.

This sample capture mesh.cap from the Wireshark Wiki has the TSFT flag set.

Time Synchronization Function Timer
.... .... .... .... .... .... .... ...1 = TSFT: Present
radiotap.present.tsft

Preference setting required: wlan_radio.timeline = TRUE

If timeline enabled but not displayed, could be one of the condition below:

"Packet number %u does not include TSF timestamp, not showing timeline."
"Packet number %u has large negative jump in TSF, not showing timeline. Perhaps TSF reference point is set wrong?"

"That looks like the wireless timeline." (Thx to Gerald for identifying)
There is an open Bugzilla tracking issues with it.
It seems to be very picky about the capture contents. Flashes the status bar yellow but message not visible.

This sample capture mesh.cap from the Wireshark Wiki has the TSFT flag set.

Time Synchronization Function Timer
.... .... .... .... .... .... .... ...1 = TSFT: Present
radiotap.present.tsft

Preference setting required: wlan_radio.timeline = TRUE

If timeline enabled but not displayed, could be one of the condition conditions below:

"Packet number %u does not include TSF timestamp, not showing timeline."
"Packet number %u has large negative jump in TSF, not showing timeline. Perhaps TSF reference point is set wrong?"

"That looks like the wireless timeline." (Thx to Gerald for identifying)
There is an open Bugzilla tracking issues with it.
It seems to be very picky about the capture contents. Flashes the status bar yellow but message not visible.

This sample capture mesh.cap from the Wireshark Wiki has the TSFT flag set.

Time Synchronization Function Timer
.... .... .... .... .... .... .... ...1 = TSFT: Present
radiotap.present.tsft

Look for wlan_radio.timestamp if no radiotap header.

Preference setting required: wlan_radio.timeline = TRUE

If timeline enabled but not displayed, could be one of the conditions below:

"Packet number %u does not include TSF timestamp, not showing timeline."
"Packet number %u has large negative jump in TSF, not showing timeline. Perhaps TSF reference point is set wrong?"