Make configuration dynamically configurable

[davidMcneil]

You should be able to configure certain attributes of the supervisor itself and running services on the fly without requiring a restart.

This probably involves:

• putting configuration in some sort of global singleton
• reading configuration from this singleton on every use instead of caching the value
• providing a way to subscribe to specific changes
• adding a command to patch the configuration

[christophermaier]

Random thought: a new command to signal the Supervisor to re-read its configuration file on-demand could be useful, or perhaps adding a file-watching setup, as we do with other parts of the Supervisor. Both require a bit of code, and the file-watching may end up using another thread. The automatic nature of the file-watching is may provide a better user experience; however, signaling-to-reload-configuration is a well-known operational pattern, and provides the most direct control of when configuration changes.

It's possible we could provide both eventually, but the explicitness of a reload command is nice, and provides a very clear interface for integrating with other tooling.

[stale[bot]]

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