A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Graylog is probably one of the more simple log aggregators out there, so if that was a bit much, you're in for a surprise.
SigNoz is probably the best all in one tooling out there at the moment. It's also a bit heavy, but it's an open source alternator DataDog, so there's a lot happening.
I found graylog and the likes nice but as you said heavy on resources. I now have a central rsyslog server (on debian 12) that first does some filtering of log lines I don't care about and then stores log in postgress. Grafana lives on that same host and I'm very happy with it. It performs quite well with just a fraction of resources graylog had as bare minimum. (The server has 4 sockets and 8Gb mem, storage to SSD while 4 firewalls, 3 switches, 4 AP's and 20 servers logging to it) In the proxmox console I see 2Gb mem is used and the cpu is bored (<5%)