add support for OTLP logging/tracing (#599)

- adds `zentelemetry` project which houses new functionality for serializing logs and traces in OpenTelemetry Protocol format (OTLP)
- moved existing stats functionality from `zencore` to `zentelemetry`
- adds `TRefCounted<T>` for vtable-less refcounting
- adds `MemoryArena` class which allows for linear allocation of memory from chunks
- adds `protozero` which is used to encode OTLP protobuf messages

1 files changed, 42 insertions, 0 deletions

diff --git a/src/zentelemetry-test/zentelemetry-test.cpp b/src/zentelemetry-test/zentelemetry-test.cpp
new file mode 100644
index 000000000..c8b067226
--- /dev/null
+++ b/src/zentelemetry-test/zentelemetry-test.cpp
@@ -0,0 +1,42 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#include <zencore/filesystem.h>
+#include <zencore/logging.h>
+#include <zencore/trace.h>
+#include <zentelemetry/zentelemetry.h>
+
+#include <zencore/memory/newdelete.h>
+
+#if ZEN_WITH_TESTS
+#	define ZEN_TEST_WITH_RUNNER 1
+#	include <zencore/testing.h>
+#	include <zencore/process.h>
+#endif
+
+int
+main([[maybe_unused]] int argc, [[maybe_unused]] char* argv[])
+{
+#if ZEN_WITH_TESTS
+	zen::zentelemetry_forcelinktests();
+
+#	if ZEN_PLATFORM_LINUX
+	zen::IgnoreChildSignals();
+#	endif
+
+#	if ZEN_WITH_TRACE
+	zen::TraceInit("zenstore-test");
+	zen::TraceOptions TraceCommandlineOptions;
+	if (GetTraceOptionsFromCommandline(TraceCommandlineOptions))
+	{
+		TraceConfigure(TraceCommandlineOptions);
+	}
+#	endif	// ZEN_WITH_TRACE
+
+	zen::logging::InitializeLogging();
+	zen::MaximizeOpenFileCount();
+
+	return ZEN_RUN_TESTS(argc, argv);
+#else
+	return 0;
+#endif
+}