perf: Perf optimizations for tracing appender

Author: cijothomas

opentelemetry-appender-tracing/src/layer.rs

@@ -189,8 +189,7 @@ where
 
         let mut log_record = self.logger.create_log_record();
 
-        // TODO: Fix heap allocation
-        log_record.set_target(target.to_string());
+        log_record.set_target(target);
         log_record.set_event_name(name);
         log_record.set_severity_number(severity);
         log_record.set_severity_text(metadata.level().as_str());

opentelemetry-sdk/src/logs/logger.rs

@@ -34,14 +34,11 @@ impl opentelemetry::logs::Logger for SdkLogger {
 
         //let mut log_record = record;
         if record.trace_context.is_none() {
-            let trace_context = Context::map_current(|cx| {
-                cx.has_active_span()
-                    .then(|| TraceContext::from(cx.span().span_context()))
+            Context::map_current(|cx| {
+                cx.has_active_span().then(|| {
+                    record.trace_context = Some(TraceContext::from(cx.span().span_context()))
+                })
             });
-
-            if let Some(ref trace_context) = trace_context {
-                record.trace_context = Some(trace_context.clone());
-            }
         }
         if record.observed_timestamp.is_none() {
             record.observed_timestamp = Some(now());