How do I reduce the loglevel on rippled? By default, rippled seems to log at the NFO level, which spits out many megabytes of log files each day. How do I reduce this level? According to the Ripple wiki, we can edit pass arguments to rippled when starting it, or edit the configuration file via [rpc_startup], but neither of these methods had any effect for me (on v0.23.0).
You can put the following in your rippled.cfg file:

[rpc_startup]
{ "command" : "log_level", "severity" : "error" }