As backend and DevOps engineer / SRM, I want to be able to visualize in Grafana metrics related to WAL files buildup due to lagging or missing replication slots.
This will help us debug WAL bloat which might exhaust the disk space and better understand the cause.

Mainly the metric filecount_size_bytes will be useful. Also any metric that would allow us to monitor per database service:
1. Total WAL size.
2. Size of WAL retained due to replication lag.
3. Rate in which we consume the WAL for the replication over time (connector consumption rate).
4. Rate in which we fill the WAL for the replication over time (rate of changes pushed into WAL).