Fix 'ceph_disk_occupation' query expressions

Need to address changes in 'ceph_disk_occupation' metric labels.

What is the change in 'ceph_disk_occupation' metric?
'ceph_disk_occupation' result now longer has 'exported_instance' label,
instead it has 'instance' label.

What is the issue we are facing because of it?
We are hitting 'PrometheusRuleFailures' due to this new label changes
for 'ceph_disk_occupation' metric in our alerts and rules.
Second issue is that we are not seeing any results for some of the
query expressions.

What is the solution?
Update the query expressions, change 'exported_instance' to 'instance'.
Any 'label_replace' action which changes 'exported_instance' label to
'instance' label is no longer required (as the 'instance' label is
directly available now)

Signed-off-by: Arun Kumar Mohan <amohan@redhat.com>

controllers/storagecluster/prometheus/localcephrules.yaml

@@ -11,10 +11,10 @@ spec:
   - name: ceph.rules
     rules:
     - expr: |
-        kube_node_status_condition{condition="Ready",job="kube-state-metrics",status="true"} * on (node) group_right() max by (node, namespace) (label_replace(ceph_disk_occupation{job="rook-ceph-mgr"},"node","$1","exported_instance","(.*)"))
+        kube_node_status_condition{condition="Ready",job="kube-state-metrics",status="true"} * on (node) group_right() max by (node, namespace) (label_replace(ceph_disk_occupation{job="rook-ceph-mgr"},"node","$1","instance","(.*)"))
       record: cluster:ceph_node_down:join_kube
     - expr: |
-        avg by (namespace) (topk by (ceph_daemon, namespace) (1, label_replace(label_replace(ceph_disk_occupation{job="rook-ceph-mgr"}, "instance", "$1", "exported_instance", "(.*)"), "device", "$1", "device", "/dev/(.*)")) * on(instance, device) group_right(ceph_daemon, namespace) topk by (instance, device, namespace) (1,(irate(node_disk_read_time_seconds_total[1m]) + irate(node_disk_write_time_seconds_total[1m]) / (clamp_min(irate(node_disk_reads_completed_total[1m]), 1) + irate(node_disk_writes_completed_total[1m])))))
+        avg by (namespace) (topk by (ceph_daemon, namespace) (1, label_replace(ceph_disk_occupation{job="rook-ceph-mgr"}, "device", "$1", "device", "/dev/(.*)")) * on(instance, device) group_right(ceph_daemon, namespace) topk by (instance, device, namespace) (1,(irate(node_disk_read_time_seconds_total[1m]) + irate(node_disk_write_time_seconds_total[1m]) / (clamp_min(irate(node_disk_reads_completed_total[1m]), 1) + irate(node_disk_writes_completed_total[1m])))))
       record: cluster:ceph_disk_latency:join_ceph_node_disk_irate1m
   - name: telemeter.rules
     rules:
@@ -171,7 +171,7 @@ spec:
         storage_type: ceph
         runbook_url: https://github.com/openshift/runbooks/blob/master/alerts/openshift-container-storage-operator/CephOSDDiskNotResponding.md
       expr: |
-        label_replace((ceph_osd_in == 1 and ceph_osd_up == 0),"disk","$1","ceph_daemon","osd.(.*)") + on(ceph_daemon, namespace, managedBy) group_left(host, device) label_replace(ceph_disk_occupation{job=~"rook-ceph-mgr|rook-ceph-mgr-external"},"host","$1","exported_instance","(.*)")
+        label_replace((ceph_osd_in == 1 and ceph_osd_up == 0),"disk","$1","ceph_daemon","osd.(.*)") + on(ceph_daemon, namespace, managedBy) group_left(host, device) label_replace(ceph_disk_occupation{job=~"rook-ceph-mgr|rook-ceph-mgr-external"},"host","$1","instance","(.*)")
       for: 15m
       labels:
         severity: critical
@@ -183,7 +183,7 @@ spec:
         storage_type: ceph
         runbook_url: https://github.com/openshift/runbooks/blob/master/alerts/openshift-container-storage-operator/CephOSDDiskUnavailable.md
       expr: |
-        label_replace((ceph_osd_in == 0 and ceph_osd_up == 0),"disk","$1","ceph_daemon","osd.(.*)") + on(ceph_daemon, namespace, managedBy) group_left(host, device) label_replace(ceph_disk_occupation{job=~"rook-ceph-mgr|rook-ceph-mgr-external"},"host","$1","exported_instance","(.*)")
+        label_replace((ceph_osd_in == 0 and ceph_osd_up == 0),"disk","$1","ceph_daemon","osd.(.*)") + on(ceph_daemon, namespace, managedBy) group_left(host, device) label_replace(ceph_disk_occupation{job=~"rook-ceph-mgr|rook-ceph-mgr-external"},"host","$1","instance","(.*)")
       for: 1m
       labels:
         severity: critical