influxdata/telegraf

[outputs.mqtt] Allow setting last will and testament

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#16,046 opened on Oct 20, 2024

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feature requesthelp wantedsize/m

Description

Use Case

Bing able to set the last will and testament means that we can tell if telegraf has disconnected ungracefully from the mqtt broker on the subscriber side.

Expected behavior

mqtt producer plugin has options to set the last will and testament topic/payload/retain/qos which are sent to the broker on connect.

Actual behavior

These options don't exist yet.

Additional info

No response

Contributor guide

Tech stack
go
Domain
backend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
golangmqtt basicstelegraf plugin architecture
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65
Research direction
Look at the existing MQTT output plugin in the Telegraf codebase, specifically the configuration struct and connection logic in the plugin file. The LWT settings should be added as new fields in the struct and passed to the MQTT client on connect. Consult the paho.mqtt.golang library documentation for LWT options. Ensure backward compatibility with existing configurations.