Gathering postmortem logs

The logs to gather for upload to a support case.

The `mustgather` script

See the appropriate page for your platform:

If the mustgather script fails, the pod logs can be gathered manually:

VMware: SSH into your analytics VM and run apic logs:
1. Use an SSH client to login as the apicadm user:
```
ssh apicadm@<analytics VM FQDN>
```
2. sudo to root:
```
sudo -i
```
3. Run the apic logs command:
```
apic logs
```
4. Two compressed files are created: appliance-logs, and node-logs. Copy both files off the VM and upload to the support case.
Kubernetes and Openshift: Get the logs from all analytics pods in your environment. Use the command:
```
kubectl -n <namespace> logs <analytics pod name> > <analytics pod name>.log
```
where:
- <namespace> is the namespace of your analytics subsystem.
- <analytics pod name> is the name of the analytics pod. See the list of analytics pods.
The logs for each pod are written to the file <analytics pod name>.log. Upload all the generated logs to the support case.

If the mustgather script fails you can use the toolkit CLI to get the status of your OpenSearch cluster, and a list of the indices.

apic login --server <platform api endpoint> --username admin --realm provider/default-idp-1

Get the OpenSearch cluster status with:

apic --mode analytics clustermgmt:catIndices --server <platform api endpoint> --analytics-service <analytics service name> --format json

Get the details of the OpenSearch indices with:

apic --mode analytics clustermgmt:catIndices --server <platform api endpoint> --analytics-service <analytics service name> --format json

Upload the cluster status and indices output to the support case.