Attempting to send a state update of an item which doesn't exist?

Release = Raspbian GNU/Linux 10 (buster)
Kernel = Linux 5.10.17-v7+
Platform = Raspberry Pi 2 Model B Rev 1.1

How do i debug the source of following log messages

2022-01-08 19:29:21.804 [WARN ] [e.internal.SseItemStatesEventBuilder] - Attempting to send a state update of an item which doesn't exist: undefined
2022-01-08 19:29:21.880 [WARN ] [e.internal.SseItemStatesEventBuilder] - Attempting to send a state update of an item which doesn't exist: frontBalconyLight_pushbutton
2022-01-08 19:29:21.886 [WARN ] [e.internal.SseItemStatesEventBuilder] - Attempting to send a state update of an item which doesn't exist: waterbooster_manual_relay
2022-01-08 19:29:21.900 [WARN ] [e.internal.SseItemStatesEventBuilder] - Attempting to send a state update of an item which doesn't exist: momroomplant_plant_light_relay

In particular, identify which OH component or script triggered the state update event, so that necessary updates can be made?

It’ll be a UI component. Watch the log as you switch between the user interface pages.

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In another topic, you already know you’ve got duplicate channels kicking around, and have trying mass Thing deletions.
I would suspect you have some ‘orphaned’ links - the channel-to-Item link, where the channel is active but the original Item has been deleted or renamed.

You are right, there were many orphan links. A few days back, had deleted all links and then re-created them one by one. These log entries are post that clean up

Many thanks - found a page which had some of the above, updated those. Only the undefined one remains - any pointers on how to identify the originating page etc ? if there any way to get the logger to log the containing page name?