Is there a list of variables for template syntax?

[AvihaiSam]

there're some examples over the resources documentation like application_id and host. is there a complete list somewhere? couldn't find any...

[jszwedko]

Hi @AvihaiSam ,

The available fields are any that exist on the event. This can vary depending on the source of the data and any transformations that have been applied. The easiest way to see which fields are available are to use vector tap to see the events flowing into a component (or wire up the console sink with encoding.codec = "json").

[AvihaiSam]

@jszwedko ok. If I understand correctly - I can:

1. access all the fields that are generated by the current component using their name without any prefix
2. access any other (previously generated) event fields with . prefix
3. access any metadata fields with % prefix.
   Am I correct?

BTW, is there a way to show the metadata fields on vector tap?
I tried vector tap -m but it doesn't show the metadata fields which can be accessed with % prefix.

[jszwedko]

That's mostly correct. 1 and 2 are actually the same though. The . prefix is optional for backwards compatibility reasons, but is recommended.

Unfortunately vector tap does not show metadata yet. That is something we'd like to add.