# Apache OpenDALâ„¢ Prometheus Layer
`opendal-layer-prometheus` registers OpenDAL operation and HTTP metrics with the `prometheus` crate.
## Use through `opendal`
Applications should normally enable this layer through the `opendal` facade with the
`layers-prometheus` feature:
```shell
cargo add opendal --features layers-prometheus
```
The layer is available as `opendal::layers::PrometheusLayer` and can be
composed with an operator through `opendal::Operator::layer`.
## Use with `opendal-core`
Add the split crates directly:
```shell
cargo add opendal-core opendal-layer-prometheus
```
Pass a configured layer to `Operator::layer`:
```rust
use opendal_core::Operator;
use opendal_layer_prometheus::PrometheusLayer;
fn add_layer(operator: Operator, layer: PrometheusLayer) -> Operator {
operator.layer(layer)
}
```
Construct and configure `layer` as described in the API documentation before
composing it with an operator.
## Documentation
- [Rust API documentation](https://docs.rs/opendal-layer-prometheus)
- [Apache OpenDAL production guide](https://opendal.apache.org/docs/core/production)
- [Apache OpenDAL documentation](https://opendal.apache.org/docs/)
## License
Licensed under the Apache License, Version 2.0.