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Create `safekeeper_pg_io_bytes_total` metric to track total amount of bytes written/read in a postgres connections to safekeepers. This metric has the following labels: - `client_az` – availability zone of the connection initiator, or `"unknown"` - `sk_az` – availability zone of the safekeeper, or `"unknown"` - `app_name` – `application_name` of the postgres client - `dir` – data direction, either `"read"` or `"write"` - `same_az` – `"true"`, `"false"` or `"unknown"`. Can be derived from `client_az` and `sk_az`, exists purely for convenience. This is implemented by passing availability zone in the connection string, like this: `-c tenant_id=AAA timeline_id=BBB availability-zone=AZ-1`. Update ansible deployment scripts to add availability_zone argument to safekeeper and pageserver in systemd service files.