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Pull Request
Updated the prometheus compose.yaml. The currently the prometheus.yaml volume mapping creates a directory in the container at /etc/prometheus/prometheus.yaml. The command in the compose file for the config sets the location at /etc/prometheus/prometheus.yaml which is a directory created by the volume mappings.
I removed the prometheus.yaml mapping from both sides of the volume mapping. This makes the config.file command correct and no longer errors with "prometheus.yaml is a directory".
Users need to create the prometheus.yaml config file in the host ./config/ folder.