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e84b9aada0
Every heatmap carried only `tooltip` and `yAxis`, missing `calculate`, `color` and `cellGap`. Grafana's heatmap plugin treats those as required, and without them the panel fails to initialise: the dashboard opens with "An error occurred within the plugin" rather than a chart. The option values are taken from the one heatmap in this stack that does render on Grafana Cloud (ledger-sync-health): calculate=false since the queries already return histogram buckets, the Turbo 64-step scheme, and cellGap=1. Each panel keeps its own yAxis label, unit and tooltip settings. This is a long-standing defect rather than fallout from the recent layout work - the same options are absent in origin/phase9 and in the cloud copies that were already live.