<ul><li>To start Prometheus by supplying a config file when installed via Homebrew on macOS, follow these steps:</li><li>Check where Prometheus binary is installed using 'which prometheus' command to confirm the installation location.</li><li>Create a basic configuration file named 'prometheus.yml' with global configurations and scrape configurations for targets.</li><li>Start Prometheus with the new config file by running 'prometheus --config.file={PATH TO prometheus.yml}' command and can query metrics using the Prometheus UI.</li></ul>

Start Prometheus by Supplying a Config File

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