encode_cloudwatch_emf_payload: Support EMF adopted payload encoder

include/cmetrics/cmt_encode_cloudwatch_emf.h

@@ -0,0 +1,43 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/*  CMetrics
+ *  ========
+ *  Copyright 2024 The CMetrics Authors
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+
+#ifndef CMT_ENCODE_CLOUDWATCH_EMF_H
+#define CMT_ENCODE_CLOUDWATCH_EMF_H
+
+#include <time.h>
+#include <cfl/cfl.h>
+#include <cmetrics/cmetrics.h>
+
+#define CMT_ENCODE_CLOUDWATCH_EMF_SUCCESS                 0
+#define CMT_ENCODE_CLOUDWATCH_EMF_INVALID_ARGUMENT_ERROR -1
+#define CMT_ENCODE_CLOUDWATCH_EMF_CREATION_FAILED        -2
+#define CMT_ENCODE_CLOUDWATCH_EMF_INVALID_DATA_ERROR     -4
+
+/* Metric Unit */
+#define CMT_EMF_UNIT_PERCENT "Percent"
+#define CMT_EMF_UNIT_BYTES   "Bytes"
+#define CMT_EMF_UNIT_COUNTER "Counter"
+
+int cmt_encode_cloudwatch_emf_create(struct cmt *cmt,
+                                     char **out_buf, size_t *out_size,
+                                     int wrap_array);
+void cmt_encode_cloudwatch_emf_destroy(char *out_buf);
+
+#endif

src/CMakeLists.txt

@@ -28,6 +28,7 @@ set(src
   cmt_encode_prometheus.c
   cmt_encode_prometheus_remote_write.c
   cmt_encode_splunk_hec.c
+  cmt_encode_cloudwatch_emf.c
   cmt_encode_text.c
   cmt_encode_influx.c
   cmt_encode_msgpack.c