statsd metrics reporting (#496)

added support for reporting metrics via statsd style UDP messaging, which is supported by many monitoring solution providers

this change adds reporting only of three cache related metrics (hit/miss/put) but this should be extended to include more metrics after additional evaluation

2 files changed, 49 insertions, 0 deletions

diff --git a/src/zennet/include/zennet/statsdclient.h b/src/zennet/include/zennet/statsdclient.h
new file mode 100644
index 000000000..a429286ae
--- /dev/null
+++ b/src/zennet/include/zennet/statsdclient.h
@@ -0,0 +1,40 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#pragma once
+
+#include <zencore/zencore.h>
+
+#include <memory>
+#include <string_view>
+
+namespace zen {
+
+class StatsTransportBase
+{
+public:
+	virtual ~StatsTransportBase()							= 0;
+	virtual void SendMessage(const void* Data, size_t Size) = 0;
+};
+
+class StatsDaemonClient
+{
+public:
+	virtual ~StatsDaemonClient() = 0;
+
+	virtual void SetMessageSize(size_t MessageSize, bool UseThreads) = 0;
+	virtual void Flush()											 = 0;
+
+	virtual void Increment(std::string_view Metric)						 = 0;
+	virtual void Decrement(std::string_view Metric)						 = 0;
+	virtual void Count(std::string_view Metric, int64_t CountDelta)		 = 0;
+	virtual void Gauge(std::string_view Metric, uint64_t CurrentValue)	 = 0;
+	virtual void Meter(std::string_view Metric, uint64_t IncrementValue) = 0;
+
+	// Not (yet) implemented: Set,Timing
+};
+
+std::unique_ptr<StatsDaemonClient> CreateStatsDaemonClient(std::string_view TargetHost = "localhost", uint16_t TargetPort = 8125);
+
+void statsd_forcelink();
+
+}  // namespace zen
diff --git a/src/zennet/include/zennet/zennet.h b/src/zennet/include/zennet/zennet.h
new file mode 100644
index 000000000..11b368cd1
--- /dev/null
+++ b/src/zennet/include/zennet/zennet.h
@@ -0,0 +1,9 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#pragma once
+
+namespace zen {
+
+void zennet_forcelinktests();
+
+}