# `Prometheus.MissingMetricSpecKeyError`
[🔗](https://github.com/prometheus-erl/prometheus.ex/blob/v5.1.0/lib/prometheus/error.ex#L128)

Raised when required metric `spec` `key` is missing. All metrics
require at least `name` and when metric created `help`.

Metrics can have their specific required keys.

# `message`

---

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