Exporter container log of replica instance always reports pg_replication_slots pq: recovery is in progress

What did you do?
I have set up a crunchy postgres cluster on my OpenShift cluster with 1 master and 2 replica instances. exporter container is running as sidecar container. All the replicas logs the following error message:

ts=2023-11-16T13:00:00.362Z caller=namespace.go:236 level=info err="Error running query on database \"localhost:5432\": pg_replication_slots pq: recovery is in progress"
ts=2023-11-16T13:00:00.379Z caller=postgres_exporter.go:731 level=error err="queryNamespaceMappings returned 1 errors"

What did you expect to see?
Replication slots on Replicas are always inactive and in recovery mode so I don't expect to see any errors here

What did you see instead? Under which circumstances?

All replicas reports the same messages listed here:

ts=2023-11-16T13:00:00.362Z caller=namespace.go:236 level=info err="Error running query on database \"localhost:5432\": pg_replication_slots pq: recovery is in progress"
ts=2023-11-16T13:00:00.379Z caller=postgres_exporter.go:731 level=error err="queryNamespaceMappings returned 1 errors"

Environment

OpenShift 4.11 on Azure

• System information:

Linux 4.18.0-372.76.1.el8_6.x86_64 x86_64

• postgres_exporter version:

postgres_exporter, version 0.10.1 (branch: HEAD, revision: 6cff384d7433bcb1104efe3b496cd27c0658eb09)
build user: root@eb21848025d7
build date: 20220114-17:20:30
go version: go1.17.6
platform: linux/amd64

• postgres_exporter flags:

        - name: CONFIG_DIR
          value: /opt/cpm/conf
        - name: POSTGRES_EXPORTER_PORT
          value: '9187'
        - name: PGBACKREST_INFO_THROTTLE_MINUTES
          value: '10'
        - name: PG_STAT_STATEMENTS_LIMIT
          value: '20'
        - name: PG_STAT_STATEMENTS_THROTTLE_MINUTES
          value: '-1'
        - name: EXPORTER_PG_HOST
          value: localhost
        - name: EXPORTER_PG_PORT
          value: '5432'
        - name: EXPORTER_PG_DATABASE
          value: postgres
        - name: EXPORTER_PG_USER
          value: ccp_monitoring
        - name: EXPORTER_PG_PASSWORD
          valueFrom:
            secretKeyRef:
              name: flexis-io-dev-scm-billing-monitoring
              key: password

• PostgreSQL version:

psql (PostgreSQL) 13.6

• Logs:

ts=2023-11-16T13:00:00.362Z caller=namespace.go:236 level=info err="Error running query on database \"localhost:5432\": pg_replication_slots pq: recovery is in progress"
ts=2023-11-16T13:00:00.379Z caller=postgres_exporter.go:731 level=error err="queryNamespaceMappings returned 1 errors"

Start by reading namespace.go around line 236 and postgres_exporter.go around line 731, where the replica query error is logged and propagated. Reproduce the exporter query against a PostgreSQL 13.6 replica in recovery, then trace how pg_replication_slots is handled. Done means replica exporters no longer report this expected recovery condition as an error while primary behavior remains correct.