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The issue could happen subtly and be hard to debug. It might also generate confusing results. For example, if the system clock for vmalert is moved 30m backward, vmalert would reset the evaluation timestamps to 30m ago, causing duplicate evaluations for timestamps within that 30m window. Exposing a new group metric `vmalert_iteration_reset_total` to help debuging this issue. fixes: https://github.com/VictoriaMetrics/VictoriaMetrics/issues/10985 https://github.com/VictoriaMetrics/VictoriaMetrics/issues/10423.