[kubernetes] Don't use wildcard for k8s systemd units

Using a wildcard to get all k8s units from journald takes
inordinately longer than specifying each unit individually.
We now explicity list each systemd k8s unit we want to get
logs for.

Signed-off-by: Edward Hope-Morley <edward.hope-morley@canonical.com>

Author: dosaboy

sos/report/plugins/kubernetes.py

@@ -348,7 +348,15 @@ def setup(self):
         super().setup()
 
     def _canonical_kubernetes(self):
-        self.add_journal(units="snap.k8s.*")
+        k8s_units = ['snap.k8s.containerd.service',
+                     'snap.k8s.etcd.service',
+                     'snap.k8s.k8sd.service',
+                     'snap.k8s.kube-apiserver.service',
+                     'snap.k8s.kube-controller-manager.service',
+                     'snap.k8s.kube-proxy.service',
+                     'snap.k8s.kube-scheduler.service',
+                     'snap.k8s.kubelet.service']
+        self.add_journal(units=k8s_units)
 
         k8s_cmd = "k8s"
         k8s_common = "/var/snap/k8s/common"