feat(accesslogs): allow filter accesslogs by service names whitelist

[ttys3]

What does this PR do?

Enhancements

allow filter accesslogs by service names whitelist

like this:

# Configuring Multiple Filters
accessLog:
  filePath: "/path/to/access.log"
  format: json
  filters:
    serviceNames:
      - "service1@file"
      - "service2@consulcatalog"
      - "service3@consulcatalog"

Motivation

we have traefik which proxy api requests to all kinds of service, its a very heavy server, we do not want traefik write all the logs, only a few kind of important service we want access logs.

currently there's no way to filter like this in traefik.

More

• Added/updated tests
• Added/updated documentation

Additional Notes

[rtribotte]

Hello @ttys3,

Thanks for this contribution!

As this would be an enhancement, the changes should target the master branch for the next v3 minor version. Could you please rebase it?

Should the filtering of access logs be configurable statically, at least only, since services are dynamic resources?
We are unsure if this is the best approach, WDYT?

[ttys3]

Hello @ttys3,

Thanks for this contribution!

As this would be an enhancement, the changes should target the master branch for the next v3 minor version. Could you please rebase it?

Should the filtering of access logs be configurable statically, at least only, since services are dynamic resources? We are unsure if this is the best approach, WDYT?

rebased and change target to master

Yes, I agree that static array filters would be a little not extenable.

I'd glad to change it from ServiceNames []string to something like ServiceNamePatterns []string

so people could use regex to match service names, but compared to static array filters, this will need a little more cpu.

do you think it is better to change it to regex ?