feat(core): add tracing sample

core/samples/tel/tracing/main.cpp

@@ -1,32 +1,37 @@
 /// [Logging and tracing include]
+#include <cubos/core/tel/level.hpp>
 #include <cubos/core/tel/logging.hpp>
 #include <cubos/core/tel/tracing.hpp>
 
+using cubos::core::tel::Level;
+using cubos::core::tel::Logger;
 using cubos::core::tel::SpanManager;
 /// [Logging and tracing include]
 
 int main()
 {
-    cubos::core::tel::Logger::level(cubos::core::tel::Logger::Level::Trace);
+    cubos::core::tel::level(Level::Debug);
 
     /// [Using macros]
+    CUBOS_SPAN_TRACE("this_wont_exist!");
+
+    CUBOS_INFO("hello from root span!"); // root span
+
     CUBOS_SPAN_INFO("main_span");
     // With this macro, a new RAII guard is created. When dropped, exits the span.
     // This indicates that we are in the span for the current lexical scope.
     // Logs and metrics from here will be associated with 'main' span.
     CUBOS_INFO("hello!");
 
-    CUBOS_SPAN_TRACE("other_scope");
+    CUBOS_SPAN_DEBUG("other_scope");
     CUBOS_INFO("hello again!");
     // ...
-    /// [Using macros]
 
     /// [Manually]
-    SpanManager::Span span("manual_span", CUBOS_SPAN_LEVEL_DEBUG, __FILE__, __LINE__);
-    SpanManager::enter(&span);
+    SpanManager::begin("manual_span", cubos::core::tel::Level::Debug);
     CUBOS_INFO("entered a manual span");
 
-    SpanManager::exit();
+    SpanManager::end();
     CUBOS_INFO("after exit manual span");
     /// [Manually]
-}
+}