Comment 4 for bug 1900639

tail -300 /var/log/juju/unit-kubernetes-master-0.log

```
2020-10-20 01:26:01 DEBUG juju.worker.dependency engine.go:564 "upgrade-check-flag" manifold worker started at 2020-10-20 01:26:01.295303721 +0000 UTC
2020-10-20 01:26:01 DEBUG juju.worker.dependency engine.go:564 "migration-fortress" manifold worker started at 2020-10-20 01:26:01.306568767 +0000 UTC
2020-10-20 01:26:01 DEBUG juju.worker.dependency engine.go:564 "migration-minion" manifold worker started at 2020-10-20 01:26:01.317095239 +0000 UTC
2020-10-20 01:26:01 INFO juju.worker.migrationminion worker.go:140 migration phase is now: NONE
2020-10-20 01:26:01 DEBUG juju.worker.dependency engine.go:564 "meter-status" manifold worker started at 2020-10-20 01:26:01.329110796 +0000 UTC
2020-10-20 01:26:01 DEBUG juju.worker.dependency engine.go:564 "api-address-updater" manifold worker started at 2020-10-20 01:26:01.329221345 +0000 UTC
2020-10-20 01:26:01 DEBUG juju.worker.dependency engine.go:564 "proxy-config-updater" manifold worker started at 2020-10-20 01:26:01.329295099 +0000 UTC
2020-10-20 01:26:01 DEBUG juju.worker.dependency engine.go:564 "metric-spool" manifold worker started at 2020-10-20 01:26:01.329421973 +0000 UTC
2020-10-20 01:26:01 DEBUG juju.worker.logger logger.go:64 initial log config: "<root>=DEBUG"
2020-10-20 01:26:01 DEBUG juju.worker.dependency engine.go:564 "logging-config-updater" manifold worker started at 2020-10-20 01:26:01.329524516 +0000 UTC
2020-10-20 01:26:01 DEBUG juju.worker.dependency engine.go:564 "charm-dir" manifold worker started at 2020-10-20 01:26:01.33004534 +0000 UTC
2020-10-20 01:26:01 DEBUG juju.worker.dependency engine.go:564 "leadership-tracker" manifold worker started at 2020-10-20 01:26:01.330076168 +0000 UTC
2020-10-20 01:26:01 INFO juju.worker.logger logger.go:118 logger worker started
2020-10-20 01:26:01 DEBUG juju.worker.leadership tracker.go:125 kubernetes-master/0 making initial claim for kubernetes-master leadership
2020-10-20 01:26:01 DEBUG juju.worker.dependency engine.go:564 "hook-retry-strategy" manifold worker started at 2020-10-20 01:26:01.33159668 +0000 UTC
2020-10-20 01:26:01 DEBUG juju.worker.logger logger.go:92 reconfiguring logging from "<root>=DEBUG" to "<root>=WARNING"
2020-10-20 04:18:36 ERROR juju.worker.dependency engine.go:671 "api-caller" manifold worker returned unexpected error: api connection broken unexpectedly
2020-10-20 17:23:05 INFO juju.cmd supercommand.go:91 running jujud [2.8.1 0 16439b3d1c528b7a0e019a16c2122ccfcf6aa41f gc go1.14.4]
2020-10-20 17:23:05 DEBUG juju.cmd supercommand.go:92 args: []string{"/var/lib/juju/tools/unit-kubernetes-master-0/jujud", "unit", "--data-dir", "/var/lib/juju", "--unit-name", "kubernetes-master/0", "--debug"}
2020-10-20 17:23:05 DEBUG juju.agent agent.go:583 read agent config, format "2.0"
2020-10-20 17:23:05 INFO juju.cmd.jujud agent.go:138 setting logging config to "<root>=WARNING"
2020-10-20 17:23:07 ERROR juju.worker.dependency engine.go:671 "api-caller" manifold worker returned unexpected error: [623655] "unit-kubernetes-master-0" cannot open api: unable to connect to API: dial tcp 10.242.109.209:17070: connect: connection refused
2020-10-20 17:23:12 ERROR juju.worker.dependency engine.go:671 "api-caller" manifold worker returned unexpected error: [623655] "unit-kubernetes-master-0" cannot open api: unable to connect to API: dial tcp 10.242.109.209:17070: connect: connection refused
2020-10-20 17:23:17 ERROR juju.worker.dependency engine.go:671 "api-caller" manifold worker returned unexpected error: [623655] "unit-kubernetes-master-0" cannot open api: unable to connect to API: dial tcp 10.242.109.209:17070: connect: connection refused
2020-10-20 17:23:24 ERROR juju.worker.dependency engine.go:671 "api-caller" manifold worker returned unexpected error: [623655] "unit-kubernetes-master-0" cannot open api: unable to connect to API: dial tcp 10.242.109.209:17070: connect: connection refused
2020-10-20 17:23:32 ERROR juju.worker.dependency engine.go:671 "api-caller" manifold worker returned unexpected error: [623655] "unit-kubernetes-master-0" cannot open api: unable to connect to API: dial tcp 10.242.109.209:17070: connect: connection refused
2020-10-20 17:24:35 ERROR juju.worker.metrics.sender sender.go:82 could not remove batch "f56fd124-2381-4122-8d91-4ea08c1c92b6" from spool: remove /var/lib/juju/metricspool/f56fd124-2381-4122-8d91-4ea08c1c92b6: no such file or directory
2020-10-20 20:19:25 ERROR juju.worker.dependency engine.go:671 "api-caller" manifold worker returned unexpected error: api connection broken unexpectedly
2020-10-20 21:24:28 INFO juju.cmd supercommand.go:91 running jujud [2.8.1 0 16439b3d1c528b7a0e019a16c2122ccfcf6aa41f gc go1.14.4]
2020-10-20 21:24:28 DEBUG juju.cmd supercommand.go:92 args: []string{"/var/lib/juju/tools/unit-kubernetes-master-0/jujud", "unit", "--data-dir", "/var/lib/juju", "--unit-name", "kubernetes-master/0", "--debug"}
2020-10-20 21:24:28 DEBUG juju.agent agent.go:583 read agent config, format "2.0"
2020-10-20 21:24:28 INFO juju.cmd.jujud agent.go:138 setting logging config to "<root>=WARNING"
2020-10-20 21:29:29 ERROR juju.worker.metrics.sender sender.go:82 could not remove batch "da8078f8-59a0-4414-8385-545acd08c457" from spool: remove /var/lib/juju/metricspool/da8078f8-59a0-4414-8385-545acd08c457: no such file or directory
```