snmp_exporter VS nut

It is kind of described here:https://github.com/prometheus/snmp_exporter/issues/405

The SNMP exporter can do lookups. Take a look at this documentation.

wget https://github.com/prometheus/snmp_exporter/releases/download/v0.21.0/snmp_exporter-0.21.0.linux-amd64.tar.gz

You need to find the OSBs for the router, and add those to the explorer. Take a look at this doc: https://github.com/prometheus/snmp_exporter/blob/main/generator/README.md

You can fetch this metrics using the SNMP exporter https://github.com/prometheus/snmp_exporter

As a maintainer of the Prometheus SNMP exporter, and the defacto standard implementation of SNMP in Go, I can tell you exactly how convoluted SNMP is at a protocol and specification level.

Refer to https://github.com/prometheus/snmp_exporter and https://blog.paessler.com/how-to-enable-snmp-on-your-operating-system

For example, you can use unpoller to bring your unifi stuff into the same system as your SNMP data.

SNMP by itself is a rather crude protocol, with values being identified as OID (Object IDs). Those are numerical identifiers. A MIB-File contains the information on how to translate these OIDs into workable data. There is some information on how to feed these files to the exporter located here: https://github.com/prometheus/snmp_exporter/tree/main/generator

Source: I help maintain open source SNMP libraries and SNMP pollers.

> what software do you recommend for gnu/linux to take input from the UPS to tell the laptop to shutdown?

https://networkupstools.org/

The Synology software is based on N.U.T. https://networkupstools.org and the Plus 1100 (listed on NUT as the Easy Power 1200) is supported in the native package with the 'blazer' driver. If you have the skills, I would SSH into the NAS and see if the device is 'noticed' or better yet recognised by the USB sub-system when you plug it it. (Normal Linux would use the lsusb command to see devices but I have no NAS handy to see if this is valid on the Synology)

Others have answered the hardware part of your question. I have not seen much mention about the software to control graceful shutdowns. For this I suggest you look at the ”Network UPS Tool” (NUT for short) project (https://networkupstools.org/). It is mostly manufacturer agnostic with clients for a vast array of hardware components.

You're looking for NUT.

Network UPS Tools is one option: https://networkupstools.org/

APC is giving me pre-nut clarity.

So no, the NAS does not monitor the battery level. The UPS does that. The NAS just acts on the messages it receives from the UPS via Synology's version of NUT - Network UPS Tools (https://networkupstools.org/). The NAS will first receive the ON_BATTERY/POWERFAIL signal. Then, eventually the BATTERY_LOW signal at which time the UPS will shutdown. So you really need to set a time for it to shut down *BEFORE* you get BATTERY_LOW.