Function set_default_instrumentation

pub fn set_default_instrumentation(
    default: fn() -> Option<Box<dyn Instrumentation>>,
) -> QueryResult<()>

Set a custom constructor for the default Instrumentation used by new connections

use diesel::connection::{set_default_instrumentation, Instrumentation, InstrumentationEvent};

// a simple logger that prints all events to stdout
fn simple_logger() -> Option<Box<dyn Instrumentation>> {
    // we need the explicit argument type there due
    // to bugs in rustc
    Some(Box::new(|event: InstrumentationEvent<'_>| {
        println!("{event:?}")
    }))
}

set_default_instrumentation(simple_logger);