I fixed the issue using an absolute path when configuring prometheus_alert_rules_files, like this:

prometheus_alert_rules_files:

  - "{{ playbook_dir }}/roles/prometheus/prometheus/rules/generic/*.yml"

The other thing I noticed is that doing {{ prometheus_alert_rules_files | map('ansible.builtin.fileglob') | flatten returns relative paths if you configure prometheus_alert_rules_files with relative paths, which is problematic with the use of ansible.builtin.copy. When using with_fileglob, the paths returned are always absolute.

Originally posted by @lsimard in #484

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