IXCobraMetricsThreadedPublisher.cpp uses a lambda to log instead of std::cerr

ws/ixcore/utils/IXCoreLogger.h

@@ -0,0 +1,22 @@
+#pragma once
+#include <functional>
+
+namespace ix
+{
+
+class IXCoreLogger
+{
+public:
+    using LogFunc = std::function<void(const char*)>;
+    static void Log(const char* msg);
+
+    static void setLogFunction(LogFunc& func) {
+        _currentLogger = func;
+    }
+
+private:
+    static LogFunc _currentLogger;
+
+};
+
+} // ix