Is there a regulation making changes to production server (via the repository and test server)?

How often changes are made, at what time, what order, etc. an Example or template.
July 9th 19 at 13:14
2 answers
July 9th 19 at 13:16
How often - depends on the project and the development process, how to roll out the update and make changes.
Time - when the server load is minimal.
July 9th 19 at 13:18
There are no regulations. It all depends on the requirements of the service.

That is, the main requirements are:
1) to minimize a simple service, ideally so that users do not notice downtime, or they were not critical.
2) to minimize the risks of making changes (put tested changes, have a ready and thought-out roll-back plan in case of a rollback)
3) to reduce the cost of making changes. For example, if it can be done in business hours, will not have to pay overtime.

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