How a single log marker replaced fragile inference in a multi-site maintenance UI

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A development team building a multi-site maintenance screen needed to highlight the currently processing site in real time using streaming backend logs. Their first approach inferred site status by watching for name changes in the logs, but non-monotonic log ordering caused sites to be falsely marked as completed before they even started. A second fix attempted to filter backward index jumps in the planned execution order, but init-phase log lines still triggered false state transitions. The team ultimately resolved the issue by anchoring state changes to a single explicit marker line, such as '[Site A] Starting maintenance', ignoring all other log output for inference purposes. A final bug involving over-broad state resets was also fixed by scoping completion clears only to sites in the current run, leaving unrelated recently-maintained sites unaffected.

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