grafana: set dur. for Prom. hyperv. disk rw rate and hdd io aler. to 90m

Set duration for Prometheus hypervisor disk rw rate and hard disk io
alerts to 90m to account for the very long running (over an hour) backup
job.

resources/chaosknoten/grafana/docker_compose/prometheus_alerts.rules.yaml

@@ -166,7 +166,7 @@ groups:
       # Longer intervals to account for disk intensive hypervisor tasks (backups, moving VMs, etc.).
       - alert: HypervisorHostUnusualDiskReadRate
         expr: (sum by (instance) (rate(node_disk_read_bytes_total[2m])) / 1024 / 1024 > 50) * on(instance) group_left (nodename) node_uname_info{nodename="chaosknoten"}
-        for: 60m
+        for: 90m
         labels:
           severity: warning
         annotations:
@@ -174,7 +174,7 @@ groups:
           description: "Disk is probably reading too much data (> 50 MB/s)\n  VALUE = {{ $value }}"
       - alert: HypervisorHostUnusualDiskWriteRate
         expr: (sum by (instance) (rate(node_disk_written_bytes_total[2m])) / 1024 / 1024 > 50) * on(instance) group_left (nodename) node_uname_info{nodename="chaosknoten"}
-        for: 60m
+        for: 90m
         labels:
           severity: warning
         annotations:
@@ -256,7 +256,7 @@ groups:
       # Since hard disks on the hypervisor can easily have their IO saturated by hypervisor tasks (backups, moving VMs, etc.), alert when the IO is above the regular threshold for a very long time.
       - alert: HypervisorHostUnusualHardDiskIo
         expr: (rate(node_disk_io_time_seconds_total{device=~"s.+"}[1m]) > 0.5) * on(instance) group_left (nodename) node_uname_info{nodename="chaosknoten"}
-        for: 50m
+        for: 90m
         labels:
           severity: warning
         annotations: