Update docs/configuring-playbook-prometheus-grafana.md: use the common placeholders

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>
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Suguru Hirahara 2025-02-03 15:35:08 +09:00
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@ -30,10 +30,10 @@ grafana_anonymous_access: false
# This has no relation to your Matrix user ID. It can be any username you'd like.
# Changing the username subsequently won't work.
grafana_default_admin_user: "some_username_chosen_by_you"
grafana_default_admin_user: "USERNAME_HERE"
# Changing the password subsequently won't work.
grafana_default_admin_password: "some_strong_password_chosen_by_you"
grafana_default_admin_password: "PASSWORD_HERE"
```
The retention policy of Prometheus metrics is [15 days by default](https://prometheus.io/docs/prometheus/latest/storage/#operational-aspects). Older data gets deleted automatically.