macro_rules! flow_begin_timestamp {
($category:tt, $label:tt, $timestamp:expr, $flow_id:expr, $context:expr $(, $key:tt => $val:expr)* $(,)?) => { ... };
($category:tt, $label:tt, $timestamp:expr, $flow_id:expr $(, $key:tt => $val:expr)* $(,)?) => { ... };
}Expand description
Similar to flow_begin!, but accepts an expression to use for the event timestamp.