/**
* Measurement aggregate.
*/
- aggregate: number
+ aggregate?: number
/**
* Measurement minimum.
*/
- minimum: number
+ minimum?: number
/**
* Measurement maximum.
*/
- maximum: number
+ maximum?: number
/**
* Measurement average.
*/
- average: number
+ average?: number
/**
* Measurement median.
*/
- median: number
+ median?: number
/**
* Measurement history.
*/