series: dense grids with explicit null gaps - #1132
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July 12, 2026 17:29
…ls for video renderer
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Prometheus.series() silently dropped empty buckets and consumers assumed dense arrays anchored at now: any historical gap (like the Jul 10-11 outage) shifted the whole chart right and truncated the left edge (aggregator-head-lag 7d started at -6d6h instead of -7d). Series are now mapped onto the dense evaluation grid with null per empty bucket; the time-series chart breaks the line at gaps, sparklines and OG cards filter nulls, /api/series emits a dense timestamp grid, and the video payload bridges gaps by interpolation to keep the external renderer contract. Old blobs parse unchanged; cache keys bumped. Verified live: 85 points with 9 nulls exactly spanning the outage.