Add tags in logger output

[Zegorax]

Use Case

We have a lot of different configurations using inputs.execd and inputs.exec. When they fail, it's difficult to identify exactly which one failed from the log output.

This feature request is about adding the set of tags in the logger output when using logformat = "structured".

It's particularly useful when using a log ingestion service (in our case, VictoriaLogs). When we have an error, we directly query the log database and add it as an annotation in the firing alert.

Expected behavior

When Telegraf outputs a log line in JSON, the following would be printed :
{"time":"2026-03-27T09:14:36.078389805Z","level":"INFO","msg":"Error connecting to target. Restarting in 10s...","category":"inputs","plugin":"execd","tags":{"server_host":"10.0.1.20","friendly_name":"friendly_server_name","log_source":"telegraf","metric_type":"logs"}}

Actual behavior

Currently, the JSON output only includes the following :
{"time":"2026-03-27T09:14:36.078389805Z","level":"INFO","msg":"Error connecting to target. Restarting in 10s...","category":"inputs","plugin":"execd"}

Additional info

No response

[Hipska]

Have you considered setting an alias for each input? (Works in normal and structured format)

[Zegorax]

Ciao @Hipska, I created this issue to be able to merge #18611
Thanks for the alias, I tried it in the past but I was not satisfied with it. I will try again :)

[Hipska]

My remark was to indicate that maybe the additions in the PR might not be needed? (I am not against them, I'm asking for a similar feature for the internal statistics)

[Zegorax]

Of course and I totally agree with you. I'm currently experiencing with alias again. If it works well with what we needed, then I may cancel the PR.