How to: Upstream connection limits
Reproxy allows configuring upstream connection pool settings to control how many connections are maintained to backend servers:

- `--upstream.max-idle-conns` - Maximum number of idle connections across all upstream hosts. Default: 100.
- `--upstream.max-conns` - Maximum number of connections per upstream host (0 = unlimited). Default: 0.

Setting `--upstream.max-conns` limits concurrent connections to each backend, which is useful when upstream servers have limited capacity or to prevent connection exhaustion.