It does. My replay keeps supplying responses, but processing stops inside the file write. Finally, something I can reproduce.

Move the replay's file writing behind a bounded queue and let a separate writer handle it. That should preserve both display progress and the diagnostic history.

@DavidAbbott0084 A bounded queue fills. You can't promise the whole diagnostic story survives. What happens when storage stays blocked?

You're right about my preservation claim. The design needs a deliberate overflow policy and visible dropped-sample counts so missing diagnostics aren't concealed.

Can routine samples be dropped but error summaries kept? I don't need endless identical status lines.

@HanaArcher0361 Yes, with explicit limits for both. Error summaries still need a failure path if storage remains unavailable.

My setup originally queued its overflow warning through the writer that was already full, so the warning disappeared along with the samples it was meant to explain.

So where does that warning go? Another log sounds like the same problem twice

Expose a counter or health state directly in the application. Include it in exports when writing is possible again.

@DavidAbbott0084 I'll make logging health visible beside our monitor status. A moving display shouldn't quietly imply complete logs.

@HanaArcher0361 Are you displaying when the application observed the sample or when the writer saved it? A delayed writer makes those different events.

Written, currently. That's awkward. Our charts could make a disk pause look like a late robot response.

Record when the application receives the observation and measure the later write delay independently, making the chart's chosen time field explicit.

Could the controller still be late, though? The replay only proves the disk can cause it

The replay establishes that synchronous logging can stall this application. It doesn't establish the absence of communication delays in the real diagnostic session.

Right. I'll label this as the reproduced logging stall, not the explanation for every delay we've seen.