# Interface MetricExpressionConfig

Properties for a concrete metric

### Synopsis

#### Properties

expression | Math expression for the metric. |

period | How many seconds to aggregate over |

usingMetrics | Metrics used in the math expression |

### Properties

#### expression

Math expression for the metric.

##### Declaration

`readonly expression: string;`

##### Property Value

string

#### period

How many seconds to aggregate over

##### Declaration

`readonly period: number;`

##### Property Value

number

#### usingMetrics

Metrics used in the math expression

##### Declaration

`readonly usingMetrics: Record<string, IMetric>;`

##### Property Value

Record<string, IMetric>