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I'm using multiple Prometheus histogram metrics following the pattern *_duration_seconds_bucket that represent latency breakdown across my pipeline. These metrics track iterations typically taking ~100ms, and I'm using le="+Inf" buckets in my queries. Currently displaying this data in Table, Bar Chart, and Histogram panels. Two issues specifically with the Histogram panel only:

X-axis bucket width: The histogram automatically sets intervals (currently 2.40ms). Is it possible to manually define these intervals (e.g., 0.5ms) through dashboard variables or panel settings? Y-axis decimal issue: The y-axis shows count values with decimals (0.5, 1.5) which doesn't make sense for count data. When I set decimals=0 in panel options, it causes duplicate labels on the axis (2-2, 3-3). How can I properly display whole numbers without this duplication?

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Thx

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  • Hmm, multiple lines with same legend value seems like a bug to me. Was able to reproduce with Histogram panel. Commented May 1 at 16:33
  • Regarding x-axis - not sure what you show. Normally (I think) it should correspond to your buckets (and I don't even know how you specified units for it). But I think your current resolution is around 0.4ms (assuming that between 0 and 2.4ms there are 6 columns) Commented May 1 at 16:35
  • grafana.com/docs/grafana/latest/fundamentals/intro-histograms and recent grafana.com/blog/2025/05/06/… Commented May 15 at 11:25
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