Add exec plugin as output

[gena01]

Would be nice to be able to execute a script that would take json metrics content and would send it to where it needs to go. (Most of these would help with various http/https api integrations)

[sparrc]

@gena01 were you thinking via stdin?

[gena01]

Precisely. This could work nicely to proxy metrics to a system currently not supported via native output plugin. This way an external script can reformat and forward these metrics where it needs to go.

[sparrc]

@gena01 Would line-protocol work? Otherwise we would need to convert metrics back to JSON from line-protocol, which wouldn't be a huge deal either.

[gena01]

Sure. Might even be better in some use cases (easier to parse?).

[voiprodrigo]

@gena01 Would line-protocol work? Otherwise we would need to convert metrics back to JSON from line-protocol, which wouldn't be a huge deal either. ...

@sparrc could this perhaps be made an option? Direct JSON access will make it easier in some cases where the output is also JSON.

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[danielnelson]

Added in #6267