49 lines
1.4 KiB
Rust
49 lines
1.4 KiB
Rust
use std::thread;
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use std::time::Duration;
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use metrics::{histogram, increment, register_counter, register_histogram};
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use metrics_exporter_prometheus::PrometheusBuilder;
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use quanta::Clock;
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fn main() {
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tracing_subscriber::fmt::init();
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let builder = PrometheusBuilder::new();
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builder
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.install()
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.expect("failed to install Prometheus recorder");
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// We register these metrics, which gives us a chance to specify a description for them. The
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// Prometheus exporter records this description and adds it as HELP text when the endpoint is
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// scraped.
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//
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// Registering metrics ahead of using them is not required, but is the only way to specify the
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// description of a metric.
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register_counter!(
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"tcp_server_loops",
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"The iterations of the TCP server event loop so far."
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);
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register_histogram!(
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"tcp_server_loop_delta_ns",
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"The time taken for iterations of the TCP server event loop."
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);
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let clock = Clock::new();
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let mut last = None;
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// Loop over and over, pretending to do some work.
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loop {
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increment!("tcp_server_loops", "system" => "foo");
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if let Some(t) = last {
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let delta: Duration = clock.now() - t;
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histogram!("tcp_server_loop_delta_ns", delta, "system" => "foo");
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}
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last = Some(clock.now());
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thread::sleep(Duration::from_millis(750));
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}
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}
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