Macro ckb_metrics::metrics

macro_rules! metrics {
    (counter, $label:literal, $value:expr $(, $span_name:expr => $span_value:expr )* $(,)?) => { ... };
    (gauge, $label:literal, $value:expr $(, $span_name:expr => $span_value:expr )* $(,)?) => { ... };
    (timing, $label:literal, $duration:expr $(, $span_name:expr => $span_value:expr )* $(,)?) => { ... };
}

Out-of-the-box macros for metrics.

• A counter is a cumulative metric that represents a monotonically increasing value which can only be increased or be reset to zero on restart.
• A gauge is a metric that can go up and down, arbitrarily, over time.
• A timing is a metric of time consumed.