netdata/netdata · error

%w: duplicate quantile %v

Error message

%w: duplicate quantile %v

What it means

Error "%w: duplicate quantile %v" thrown in netdata/netdata.

Source

Thrown at src/go/pkg/metrix/summary.go:226

	if schema == nil || len(schema.quantiles) == 0 {
		if len(point.Quantiles) > 0 {
			panic(fmt.Errorf("%w: quantiles are not configured for this instrument", errSummaryPoint))
		}
		return point.Count, point.Sum, nil
	}

	if len(point.Quantiles) != len(schema.quantiles) {
		panic(fmt.Errorf("%w: quantile count mismatch", errSummaryPoint))
	}

	values := make([]SampleValue, len(schema.quantiles))
	seen := make(map[float64]struct{}, len(schema.quantiles))
	for _, q := range point.Quantiles {
		if math.IsNaN(q.Quantile) || q.Quantile < 0 || q.Quantile > 1 {
			panic(fmt.Errorf("%w: invalid quantile %v", errSummaryPoint, q.Quantile))
		}
		if _, ok := seen[q.Quantile]; ok {
			panic(fmt.Errorf("%w: duplicate quantile %v", errSummaryPoint, q.Quantile))
		}
		seen[q.Quantile] = struct{}{}

		idx := summaryQuantileIndex(schema.quantiles, q.Quantile)
		if idx == -1 {
			panic(fmt.Errorf("%w: quantile %v is not declared", errSummaryPoint, q.Quantile))
		}
		// A summary may report a NaN quantile value (e.g. an empty observation window). Store it;
		// chartengine renders a non-finite dimension value as a gap (SETEMPTY). Reject only Inf.
		if math.IsInf(float64(q.Value), 0) {
			panic(fmt.Errorf("%w: infinite quantile value %v", errSummaryPoint, q.Value))
		}
		values[idx] = q.Value
	}

	if len(seen) != len(schema.quantiles) {
		panic(fmt.Errorf("%w: missing quantiles in point", errSummaryPoint))
	}

View on GitHub (pinned to 4864de85e2)

Solutions

1. The same quantile was declared more than once.
2. Remove the duplicate quantile from the schema declaration.

When it happens

Trigger: Thrown at src/go/pkg/metrix/summary.go:226 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of netdata/netdata@4864de85e2 (2026-08-15). Data as JSON: /api/errors/e13c4a0a02f81fc7. Report an issue: GitHub.