# Metric selection

The `MetricSelection` field in a study specifies the metrics of the system. Such selection has only the purpose to specify which metrics need to be tracked while running the study and does not affect the optimization.

In case this selection is not specified, all metrics are considered.

A metrics selection can either assume the value of `all` to indicate that all the available metrics of the system of the study should be tracked, or can assume the value of a list of the names of metrics of the system that should be tracked prepended with the name of the component.

### Example

The following fragment is an example:

```yaml
metricsSelection:
  - application.response_time
  - application.error_rate
  - jvm1.gc_time
```


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