feat: add Zabbix output plugin

Add output plugin to support sending metrics to Zabbix
(https://www.zabbix.com/).

This output plugin handle sending metrics as traps, generating LLD data
to feed discovery rules and is able to send autoregistration requests.

docs/LICENSE_OF_DEPENDENCIES.md

@@ -102,6 +102,7 @@ following works:
 - github.com/cpuguy83/dockercfg [MIT License](https://github.com/cpuguy83/dockercfg/blob/main/LICENSE)
 - github.com/cpuguy83/go-md2man [MIT License](https://github.com/cpuguy83/go-md2man/blob/master/LICENSE.md)
 - github.com/danieljoos/wincred [MIT License](https://github.com/danieljoos/wincred/blob/master/LICENSE)
+- github.com/datadope-io/go-zabbix [MIT License](https://github.com/datadope-io/go-zabbix/blob/master/LICENSE)
 - github.com/davecgh/go-spew [ISC License](https://github.com/davecgh/go-spew/blob/master/LICENSE)
 - github.com/devigned/tab [MIT License](https://github.com/devigned/tab/blob/master/LICENSE)
 - github.com/dgryski/go-rendezvous [MIT License](https://github.com/dgryski/go-rendezvous/blob/master/LICENSE)

go.mod

@@ -211,6 +211,8 @@ require (
 	modernc.org/sqlite v1.24.0
 )
 
+require github.com/datadope-io/go-zabbix v1.5.1
+
 require (
 	cloud.google.com/go v0.110.4 // indirect
 	cloud.google.com/go/compute v1.20.1 // indirect

go.sum

@@ -438,6 +438,8 @@ github.com/creack/pty v1.1.18 h1:n56/Zwd5o6whRC5PMGretI4IdRLlmBXYNjScPaBgsbY=
 github.com/cyphar/filepath-securejoin v0.2.3/go.mod h1:aPGpWjXOXUn2NCNjFvBE6aRxGGx79pTxQpKOJNYHHl4=
 github.com/danieljoos/wincred v1.2.0 h1:ozqKHaLK0W/ii4KVbbvluM91W2H3Sh0BncbUNPS7jLE=
 github.com/danieljoos/wincred v1.2.0/go.mod h1:FzQLLMKBFdvu+osBrnFODiv32YGwCfx0SkRa/eYHgec=
+github.com/datadope-io/go-zabbix v1.5.1 h1:/SNjwkjKJk7tcjsaJsBup7KiuT4W8D5LsUd4YY5DLYk=
+github.com/datadope-io/go-zabbix v1.5.1/go.mod h1:jzkWTN7c4CB5dsIA9KL8Ljx86REgmnXtcPsHwrbZ8HM=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=

plugins/outputs/all/zabbix.go

@@ -0,0 +1,5 @@
+//go:build !custom || outputs || outputs.zabbix
+
+package all
+
+import _ "github.com/influxdata/telegraf/plugins/outputs/zabbix" // register plugin