Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/serializers/msgpack/README.md

@@ -0,0 +1,43 @@
+# MessagePack
+
+[MessagePack](https://msgpack.org) is an efficient binary serialization format. It lets you exchange data among multiple languages like JSON.
+
+## Format Definitions
+
+Output of this format is MessagePack binary representation of metrics that have identical structure of the below JSON.
+
+```json
+{
+   "name":"cpu",
+   "time": <TIMESTAMP>, // https://github.com/msgpack/msgpack/blob/master/spec.md#timestamp-extension-type
+   "tags":{
+      "tag_1":"host01",
+      ...
+   },
+   "fields":{
+      "field_1":30,
+      "field_2":true,
+      "field_3":"field_value"
+      "field_4":30.1
+      ...
+   }
+}
+```
+
+MessagePack has it's own timestamp representation. You can find additional information from [MessagePack specification](https://github.com/msgpack/msgpack/blob/master/spec.md#timestamp-extension-type).
+
+## MessagePack Configuration
+
+There are no additional configuration options for MessagePack format.
+
+```toml
+[[outputs.file]]
+  ## Files to write to, "stdout" is a specially handled file.
+  files = ["stdout", "/tmp/metrics.out"]
+
+  ## Data format to output.
+  ## Each data format has its own unique set of configuration options, read
+  ## more about them here:
+  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md
+  data_format = "msgpack"
+```