add pop sizing

[swethalohith2]

Why

Customers often ask how to size the PoP hardware configuration before installing the PoP

What

Add pop sizing command

References

Story

[rongzhus]

For final result, we can separate to 4 parts, below is an example, it is more clear:

Please answer below questions for estimating the self-hosted PoP hardware size:

How many API Simple tests do you want to create? (0 if no) 100
What is the test frequency for your API Simple tests? (1-120) 1
How many API Script tests do you want to create? (0 if no) 10
What is the test frequency for your API Script tests? (1-120) 5
How many Browser tests (Webpage Action, Webpage Script and BrowserScript) do you want to create? (0 if no) 10
What is the test frequency for Browser tests? (1-120) 5
Do you want to install the Instana-agent to monitor your PoP? (Y/N) Y
How many worker nodes in your kubernetes cluster? 3

Your requirement is:
    API Simple: 1000    Frequency: 1min
    API Script: 50      Frequency: 5min
    Browser Test: 50    Frequency: 10min
    Install Agent: Yes

The estimated sizing is:
    CPU: 15700m
    Mem: 14242MiB
    Disk: 7240GB

Recommend Playback engine pods are:
    http        playback engines: 1 pod
    javascript  playback engines: 1 pod
    browser     playback engines: 2 pod

[rongzhus]

When all test number is 0, there are still an estimated size of resources , is it default value? In such case, the command can exit and show a warning message.

[swethalohith2]

When all test number is 0, there are still an estimated size of resources , is it default value? In such case, the command can exit and show a warning message.

This is because there is default pods for controller, Redis and k8ssensor.

[rongzhus]

When all test number is 0, there are still an estimated size of resources , is it default value? In such case, the command can exit and show a warning message.

This is because there is default pods for controller, Redis and k8ssensor.

It does not make sense when no any test and no agent, it is OK to output 0 for both pod and mem/cpu/disk. for example:

Your requirement is:
    API Simple:  0
    API Script:  0 
    Browser Test: 0
    Install Agent: N

The estimated sizing is:
    CPU: 0m
    Mem: 0MiB
    Disk: 0GB

Recommend Playback engine pods are:
    http        playback engines: 0 pod
    javascript  playback engines: 0 pod
    browser     playback engines: 0 pod

[rongzhus]

LGTM.