grafana/k6 · error

an invalid type (%s) is specified for an InfluxDB field (%s)

Error message

an invalid type (%s) is specified for an InfluxDB field (%s)

What it means

A tag listed in K6_INFLUXDB_TAGS_AS_FIELDS was given a type suffix that is not one of string, bool, float or int. MakeFieldKinds switches on the declared field type and falls through to this error for the named field.

Source

Thrown at internal/output/influxdb/util.go:86

			fieldType = "string"
		}

		err := checkDuplicatedTypeDefinitions(fieldKinds, fieldName)
		if err != nil {
			return nil, err
		}

		switch fieldType {
		case "string":
			fieldKinds[fieldName] = String
		case "bool":
			fieldKinds[fieldName] = Bool
		case "float":
			fieldKinds[fieldName] = Float
		case "int":
			fieldKinds[fieldName] = Int
		default:
			return nil, fmt.Errorf("an invalid type (%s) is specified for an InfluxDB field (%s)",
				fieldType, fieldName)
		}
	}

	return fieldKinds, nil
}

View on GitHub (pinned to 01ffac6f24)

Solutions

1. Use one of the supported types: string, bool, float or int
2. Example: K6_INFLUXDB_TAGS_AS_FIELDS=check_name:string,check_duration:float

When it happens

Trigger: Thrown at internal/output/influxdb/util.go:86 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of grafana/k6@01ffac6f24 (2026-08-18). Data as JSON: /api/errors/1bdf6e14f2488e3b. Report an issue: GitHub.