diff --git a/alerts/absent_alerts.libsonnet b/alerts/absent_alerts.libsonnet
index e8630e7..b032117 100644
--- a/alerts/absent_alerts.libsonnet
+++ b/alerts/absent_alerts.libsonnet
@@ -7,7 +7,7 @@
           {
             alert: 'CephMgrIsAbsent',
             expr: |||
-              absent(up{%(cephExporterSelector)s} == 1)
+              up{%(cephExporterSelector)s} == 0
             ||| % $._config,
             'for': $._config.mgrIsAbsentAlertTime,
             labels: {
diff --git a/extras/manifests/prometheus-ceph-rules.yaml b/extras/manifests/prometheus-ceph-rules.yaml
index e590291..cc46355 100644
--- a/extras/manifests/prometheus-ceph-rules.yaml
+++ b/extras/manifests/prometheus-ceph-rules.yaml
@@ -11,7 +11,7 @@ spec:
   - name: ceph.rules
     rules:
     - expr: |
-        kube_node_status_condition{condition="Ready",job="kube-state-metrics",status="true"} * on (node) group_right() max(label_replace(ceph_disk_occupation{job="rook-ceph-mgr"},"node","$1","exported_instance","(.*)")) by (node)
+        kube_node_status_condition{condition="Ready",job="kube-state-metrics",status="true"} * on (node) group_right() max(label_replace(ceph_disk_occupation{job="rook-ceph-mgr"},"node","$1","exported_instance","(.*)")) by (node, namespace)
       record: cluster:ceph_node_down:join_kube
     - expr: |
         avg(topk by (ceph_daemon) (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) topk by (instance,device) (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])))))
@@ -42,7 +42,7 @@ spec:
         severity_level: critical
         storage_type: ceph
       expr: |
-        absent(up{job="rook-ceph-mgr"} == 1)
+        up{job="rook-ceph-mgr"} == 0
       for: 5m
       labels:
         severity: critical
diff --git a/rules/rules.libsonnet b/rules/rules.libsonnet
index af5d821..7cb199f 100644
--- a/rules/rules.libsonnet
+++ b/rules/rules.libsonnet
@@ -7,7 +7,7 @@
           {
             record: 'cluster:ceph_node_down:join_kube',
             expr: |||
-              kube_node_status_condition{condition="Ready",job="kube-state-metrics",status="true"} * on (node) group_right() max(label_replace(ceph_disk_occupation{%(cephExporterSelector)s},"node","$1","exported_instance","(.*)")) by (node)
+              kube_node_status_condition{condition="Ready",job="kube-state-metrics",status="true"} * on (node) group_right() max(label_replace(ceph_disk_occupation{%(cephExporterSelector)s},"node","$1","exported_instance","(.*)")) by (node, namespace)
             ||| % $._config,
           },
           {