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Grafana Memory Bug Fixed: Time Comparison Feature Used 3x More RAM Than Needed

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A contributor to Grafana identified and fixed a memory inefficiency in the platform's Time Comparison feature, which overlays an earlier time period onto the current one for side-by-side analysis. The bug caused comparison panels to consume roughly six times the expected memory — 76.4 MB instead of an anticipated ~25 MB — due to thousands of unnecessary null data points being generated. The root cause was that the gap-filling step ran before the comparison frame was time-shifted, causing it to measure a 24-hour offset as a single large gap and pad each data series with up to 4,320 null entries. The fix reordered the logic so gap filling references the frame's own effective time range rather than the current display window. After the patch, the compare frame's point count dropped from 3.24 million to 1.08 million, and a 12-panel dashboard's heap usage fell from 822.5 MB to 225 MB.

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Grafana Memory Bug Fixed: Time Comparison Feature Used 3x More RAM Than Needed · ShortSingh