how to mirror only specific traffic, based on ACLs

[c031917]

We have a complex HAproxy config with lots of frontends and backends. The config is auto-generated, based on a template which renders in a loop all existing www,ws,... services for 1-n customers, using docker-gen.
We now want to mirror certain traffic, e.g. only for customer1 and customer2, but not for customer 3. The original traffic is routed to 1-n backends on 1-n docker containers.

I tried this in mirror.cfg:
[mirror]
spoe-agent mirror
log global
messages mirror
acl customer1-mirror_rule hdr(host) -i ws.customer1.com
use-backend mirroragents if customer1-mirror_rule

but this syntax is not valid: "parsing [/etc/haproxy/mirror.conf:5] : unknown keyword 'acl' in spoe-agent section"

Is there a way to limit mirroring to specific streams and what is the syntax?

Second question: As I have to specify the target URL when starting the spoe-agent, mirrored traffic for customer1 & 2 go to that single target. Can I run a second agent and route mirror traffic of customer2 to a different URI ?

[scofield-ua]

@c031917 have you checked https://www.haproxy.com/blog/haproxy-traffic-mirroring-for-real-world-testing/#tuning-the-mirrored-traffic?

This part:

spoe-message mirror-msg
    args arg_method=method arg_path=url arg_ver=req.ver arg_hdrs=req.hdrs_bin arg_body=req.body
    acl is_search path_beg /search
    event on-frontend-http-request if is_search