# `NervesHubLink.Extensions.Health.MetricSet`
[🔗](https://github.com/nerves-hub/nerves_hub_link/blob/v2.12.0/lib/nerves_hub_link/extensions/health/metric_set.ex#L5)

Behaviour for implementing a custom metric set to be used in a report.

# `sample`

```elixir
@callback sample() :: %{required(String.t() | atom()) => number()}
```

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*Consult [api-reference.md](api-reference.md) for complete listing*