This revert 17d807f0 and re-adds the metadata plugin as a plugin that
just sets a label to a value function.
Add package documentation on how to use the metadata package. Make it
clear that any caching is up to the Func implemented.
There are now - no in tree users. We could add the request metadata by
default under names that copy request.Request, i.e
request/ip - remote IP
request/port - remote port
Variables.go has been deleted.
Signed-off-by: Miek Gieben <miek@miek.nl>
* plugin/metadata: some cleanups
Name to provider.go as that's what being defined right now in the file.
Use request.Request because that's done in variables.go anyway. Name the
main storage M, because there is no further meaning behind.
Remove superfluous methods
Signed-off-by: Miek Gieben <miek@miek.nl>
* Fix test
Signed-off-by: Miek Gieben <miek@miek.nl>
