# derust - prometheus
Automatic HTTP requests duration metrics as `http_server_seconds`
Automatic duration metrics for features:
- `http_client` as `http_client_seconds`
- `postgres` as:
- `repository_transaction_seconds`
- `repository_query_seconds`
## [Example](https://github.com/deroldo/derust/tree/main/examples/metrics/prometheus)
```toml
# Cargo.toml
[package]
# ...
[dependencies]
derust = { version = "0.2.1", features = ["prometheus"] }
regex = { version = "1.11.1" }
# ...
```
```rust
// main.rs
// ...
use derust::metricx::{current_gauge, increment, increment_one, record_duration, record_money, start_stopwatch, MetricTags, PrometheusConfig};
// ...
#[derive(Clone)]
pub struct AppState {}
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
// ...
// any cloneable struct
let app_state = AppState {};
let application_name = "sample";
// prometheus
let prometheus_config = PrometheusConfig {
denied_metric_tags: vec!["customer".to_string()], // any high cardinality http tags (log tags)
denied_metric_tags_by_regex: vec![Regex::new(".+_id$").unwrap()], // any high cardinality http tags regex (log tags)
};
// easy way to get application context things, like your application state struct
// automatic metrics route
let context = AppContext::new(application_name, env, prometheus_config, app_state)?;
// start as the basic
// ...
}
```
```rust
let tags = HttpTags::from([
("kind", "foo"),
("customer_id", "1"), // will be ignored with that configuration by `denied_metric_tags`
]);
increment(&context, "counter_metric_name", MetricTags::from(&tags), 10);
increment_one(&context, "counter_metric_name", MetricTags::from(&tags));
current_gauge(&context, "gauge_metric_name", MetricTags::from(&tags), 100.0);
record_money(&context, "money_metric_name", MetricTags::from(&tags), 100.0);
record_duration(&context, "duration_metric_name", MetricTags::from(&tags), 100.0);
let stopwatch = start_stopwatch(&context,"duration_metric_name", MetricTags::from(&tags));
// ...
stopwatch.record(MetricTags::from(&tags));
```