send tracing event logs over logs stream (#75)

Author: davidhewitt

src/bridges/log.rs

@@ -1,6 +1,7 @@
 use std::{borrow::Cow, sync::OnceLock};
 
 use log::{LevelFilter, Metadata, Record};
+use tracing_opentelemetry::OpenTelemetrySpanExt;
 
 use crate::internal::logfire_tracer::LogfireTracer;
 
@@ -41,7 +42,7 @@ impl log::Log for LogfireLogger {
         if self.enabled(record.metadata()) {
             self.tracer.export_log(
                 "log message",
-                &tracing::Span::current(),
+                &tracing::Span::current().context(),
                 record.args().to_string(),
                 level_to_severity(record.level()),
                 "{}",
@@ -1185,6 +1186,8 @@ mod tests {
         1970-01-01T00:00:00.000004Z  WARN logfire::bridges::log::tests warning log
         1970-01-01T00:00:00.000005Z ERROR logfire::bridges::log::tests error log
         1970-01-01T00:00:00.000006Z TRACE logfire::bridges::log::tests trace log
+        1970-01-01T00:00:00.000007Z DEBUG opentelemetry_sdk::metrics::meter_provider User initiated shutdown of MeterProvider. name=MeterProvider.Shutdown
+        1970-01-01T00:00:00.000008Z DEBUG opentelemetry_sdk::logs::logger_provider  name=LoggerProvider.ShutdownInvokedByUser
         ");
     }
 }