How do I monitor my UPS on Linux?

Depending on which UPS vendor you choose, there are different methods of monitoring the UPS hardware. Here are two common UPS types and monitoring software configurations:

• APC:
  • Serial/USB: How do I monitor my APC UPS on Linux?
  • Network: How do I monitor my APC UPS over the network on Linux?
• Dell: How do I monitor my Dell UPS on Linux?