Add snapshots-related limits returned in capabilties

[bwsw]

ISSUE TYPE

• Feature Idea

COMPONENT NAME

API

CLOUDSTACK VERSION

4.12

CONFIGURATION

OS / ENVIRONMENT

SUMMARY

Add VM snapshots and disk snapshots configured limitations in response for listCapabilties.

We propose adding snapshots-related capabilities for disk snapshots and VM snapshots because these capabilities limit the use of snapshots and thus must be disclosed to users. As these limits are cloud-wide, not user-specific they must be disclosed to users with listCapabilities.

Without the disclosure users (especially regular users in multi-tenant environments) can not understand the outcomes of operations when they exceed limits before the configuration command for snapshotting is sent to the server.

The disclosure for these pararmeters doesn't lead to a security problems as all of them can be deducted by users in an empirical way.

When client application knows them better interfaces can be created:

• Early configuration detection when limits are exceeded;
• Better localization for errors handling because the client can handle errors before sending requests to the server and thus manage logic itself;
• Better interfaces and explicit behaviors can be implemented.

We propose these features because would like to address them in the next versions of CloudStack-UI software.

What to disclose:

• VM snapshots maximum amount
• VM snaphost expire interval
• Disk snapshots maximum hourly/daily/weekly/monthly

STEPS TO REPRODUCE

EXPECTED RESULTS

New capabilities elements returned in API.

[DaanHoogland]

added comments in the PR. I'd like to see how this is useful in the UI or in a script.

[DaanHoogland]

@bwsw is still ongoing?

[nvazquez]

Marking as unplanned as the PR has been inactive for more than a year