[bug]: `lncli debuglevel --level info` not working in `v0.19.x`

[leesalminen]

Background

Previous to v0.19.x (i.e. in v0.18.5), I could run lncli debuglevel --level info to reduce log verbosity. This no longer works and I continue to receive DBG logs after running the above command. It does appear to only affect the PEER subsystem, other subsystems seem to respect the command.

Your environment

• version of lnd: v0.19.1
• which operating system (uname -a on *Nix): Linux lnd-0 6.6.72+ Fix name typo in README #1 SMP PREEMPT_DYNAMIC Sun Apr 27 08:53:34 UTC 2025 x86_64 Linux
• version of btcd, bitcoind, or other backend:
• any other relevant environment details

Steps to reproduce

• In lnd.conf, have debuglevel=debug
• Start lnd, let it finish syncing to chain, graph, etc
• Once up and running, try to reduce log verbosity with lncli debuglevel --level info
• Logs continue to output at DBG level, specifically for the PEER subsystem.

Expected behaviour

Only logs of INF level should output after setting debuglevel

Actual behaviour

Logs for the PEER subsystem continue to output at DBG level

Example:

/ # lncli debuglevel --level info
{
    "sub_systems":  "ACSM=INF, ARPC=INF, ATPL=INF, BLPT=INF, BRAR=INF, BTCN=INF, BTWL=INF, CHAC=INF, CHBU=INF, CHCL=INF, CHDB=INF, CHFD=INF, CHFT=INF, CHIO=INF, CHNF=INF, CHRE=INF, CLUS=INF, CMGR=INF, CNCT=INF, CNFG=INF, CRTR=INF, DISC=INF, DRPC=INF, FNDG=INF, GRDB=INF, GRPH=INF, HLCK=INF, HSWC=INF, INVC=INF, IRPC=INF, LCHN=INF, LNWL=INF, LTND=INF, MSGX=INF, NANN=INF, NRPC=INF, NTFN=INF, NTFR=INF, PEER=INF, PFSM=INF, PRNF=INF, PROM=INF, PRPC=INF, RPCC=INF, RPCP=INF, RPCS=INF, RPWL=INF, RRPC=INF, SGNR=INF, SPHX=INF, SQLB=INF, SQLD=INF, SRVR=INF, SWPR=INF, TORC=INF, UTXN=INF, VRPC=INF, WLKT=INF, WTCL=INF, WTWR=INF"
}

Shortly (seconds after running above):

2025-07-16 14:51:07.423 [DBG] PEER: Peer(020003b9499a97c8dfbbab6b196319db37ba9c37bccb60477f3c867175f417988e): Received ChannelUpdate(chain_hash=000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f, short_chan_id=952307911615119360, mflags=00000001, cflags=00000000, update_time=2025-07-16 14:47:53 +0000 UTC) from 020003b9499a97c8dfbbab6b196319db37ba9c37bccb60477f3c867175f417988e@vr47stl576kawzuogikujvopddkztcsjigvu2jgnkcztl5kupjytumqd.onion:9735

[Roasbeef]

Thanks for the report!

Fixed by #10085