Link to aggregated logs from mig-ui

[djwhatle]

Overview

It would be helpful to link to the unified log streams for each cluster from the UI. We could show a link to view all logs for the source or target cluster. It appears (looking at 3.11 and 4.6) that the URL to the logs is the same. We will need to resolve:

• the route name for the console
• the current pod name for mig-log-reader

There are a couple of options for how we could feed this info to UI. Perhaps the most suitable would be to provide a new endpoint on the discovery service that would feed back a logs URL for a particular MigCluster.

Sample OCP 3 unified logs URL

https://<console_url_here>/k8s/ns/openshift-migration/pods/migration-log-reader-5bc98b97cd-njhf6/logs

To build the URL above, we need

1. the console URL (oc get route console -n openshift-console)
2. the migration-log-reader pod name (oc get pod -n openshift-migration -l logreader=mig)

Sample OCP 4 unified logs URL

https://<console_url_here>/k8s/ns/openshift-migration/pods/migration-log-reader-7cc944f5d4-gmpt7/logs?container=plain

To build the URL above, we need

1. the console URL (oc get route console -n openshift-console
2. the migration-log-reader pod name (oc get pod -n openshift-migration -l logreader=mig)

[djwhatle]

@ibolton336 @vconzola @eriknelson for CLI-based logs, we just need to give the user one command:

oc logs --follow --namespace openshift-migration --selector logreader=mig --container color

This will work on any cluster where MTC is installed, assuming the user has enabled mig-log-reader (enabled by default).