The Telegraf custom builder is a tool that allows users to select which plugins to build the Telegraf binary with, reducing its overall memory and disk footprint. The tool was created to address the growing size of the Telegraf binary and provide a streamlined process for users to build a slimmer binary relevant to their use case. It can be used when a firm decision on which plugins has been made or when building from source is comfortable. The custom builder can help with future scalability of Telegraf, as adding more features over time increases its size. Users can create a customized Telegraf binary by pointing the tool at their Telegraf configuration file and running it through the `./tools/custom_builder/custom_builder` command. The resulting binary is significantly smaller than the full Telegraf binary, making it suitable for resource-constrained devices.