Post-query value transforms for unit conversion.
Applied to aggregated values after bucketing. Useful for converting raw SNMP values (e.g. tenths of dBmV) to human-readable units.
Supported transforms
{:multiply, n}— multiply each value by n{:divide, n}— divide each value by n{:offset, n}— add n to each value{:scale, multiplier, offset}—value * multiplier + offset(e.g. Celsius to Fahrenheit){:log10}— base-10 logarithm (useful for RF power ratios)nil— no transform (passthrough)
Summary
Functions
Apply a transform to a list of {timestamp, value} tuples.
Parse a transform string from HTTP params.
Parse a threshold filter string.
Functions
Apply a transform to a list of {timestamp, value} tuples.
Parse a transform string from HTTP params.
Examples
parse("divide:10") #=> {:divide, 10.0}
parse("multiply:100") #=> {:multiply, 100.0}
parse("offset:-273") #=> {:offset, -273.0}
parse("scale:1.8:32") #=> {:scale, 1.8, 32.0}
parse("log10") #=> {:log10}
parse(nil) #=> nilParse a threshold filter string.
Examples
parse_threshold("filter_gt:90") #=> {:gt, 90.0}
parse_threshold("filter_lt:10") #=> {:lt, 10.0}
parse_threshold(nil) #=> nil