Show HN: An ergonomic metrics crate for Rust

use prometric_derive::metrics; use prometric::{Counter, Gauge, Histogram}; // The `scope` attribute is used to set the prefix for the metric names in this struct. #[metrics(scope = "app")] struct AppMetrics { /// The total number of HTTP requests. #[metric(rename = "http_requests_total", labels = ["method", "path"])] http_requests: Counter, // For histograms, the `buckets` attribute is optional. It will default to [prometheus::DEFAULT_BUCKETS] if not provided. /// The duration of HTTP requests. #[metric(labels = ["method", "path"], buckets = [0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1.0, 2.5, 5.0])] http_requests_duration: Histogram, /// This doc comment will be overwritten by the `help` attribute. #[metric(rename = "current_active_users", labels = ["service"], help = "The current number of active users.")] current_users: Gauge, /// The balance of the account, in dollars. Uses a floating point number. #[metric(rename = "account_balance", labels = ["account_id"])] account_balance: Gauge<f64>, /// The total number of errors. #[metric] errors: Counter, } // Build the metrics struct with static labels, which will initialize and register the metrics with the default registry. // A custom registry can be used by passing it to the builder using `with_registry`. let metrics = AppMetrics::builder().with_label("host", "localhost").with_label("port", "8080").build(); // Metric fields each get an accessor method generated, which can be used to interact with the metric. // The arguments to the accessor method are the labels for the metric. metrics.http_requests("GET", "/").inc(); metrics.http_requests_duration("GET", "/").observe(1.0); metrics.current_users("service-1").set(10); metrics.account_balance("1234567890").set(-12.2); metrics.errors().inc();

# HELP app_account_balance The balance of the account, in dollars. Uses a floating point number. # TYPE app_account_balance gauge app_account_balance{account_id="1234567890",host="localhost",port="8080"} -12.2 # HELP app_current_active_users The current number of active users. # TYPE app_current_active_users gauge app_current_active_users{host="localhost",port="8080",service="service-1"} 20 # HELP app_errors The total number of errors. # TYPE app_errors counter app_errors{host="localhost",port="8080"} 1 # HELP app_http_requests_duration The duration of HTTP requests. # TYPE app_http_requests_duration histogram app_http_requests_duration_bucket{host="localhost",method="GET",path="/",port="8080",le="0.005"} 0 app_http_requests_duration_bucket{host="localhost",method="GET",path="/",port="8080",le="0.01"} 0 app_http_requests_duration_bucket{host="localhost",method="GET",path="/",port="8080",le="0.025"} 0 app_http_requests_duration_bucket{host="localhost",method="GET",path="/",port="8080",le="0.05"} 0 app_http_requests_duration_bucket{host="localhost",method="GET",path="/",port="8080",le="0.1"} 0 app_http_requests_duration_bucket{host="localhost",method="GET",path="/",port="8080",le="0.25"} 0 app_http_requests_duration_bucket{host="localhost",method="GET",path="/",port="8080",le="0.5"} 0 app_http_requests_duration_bucket{host="localhost",method="GET",path="/",port="8080",le="1"} 1 app_http_requests_duration_bucket{host="localhost",method="GET",path="/",port="8080",le="2.5"} 1 app_http_requests_duration_bucket{host="localhost",method="GET",path="/",port="8080",le="5"} 1 app_http_requests_duration_bucket{host="localhost",method="GET",path="/",port="8080",le="+Inf"} 1 app_http_requests_duration_sum{host="localhost",method="GET",path="/",port="8080"} 1 app_http_requests_duration_count{host="localhost",method="GET",path="/",port="8080"} 1 # HELP app_http_requests_total The total number of HTTP requests. # TYPE app_http_requests_total counter app_http_requests_total{host="localhost",method="GET",path="/",port="8080"} 2 app_http_requests_total{host="localhost",method="POST",path="/",port="8080"} 2