Notification service in a decentralized control plane of a computing system

A computer system, comprising:

• a hardware platform having a central processing unit (CPU), memory, and storage;
• a software platform executing on the hardware platform, the software platform includes a service host process of a control plane, the service host process executable by the CPU to:
• manage services of the control plane and a persistent document store in the storage that stores service states for the services;
• create a query task service of the control plane in addition to the services, a service state of the query task service including a query filter;
• evaluate each service state of the services against the query filter as each service state of the services is added to the persistent document store;
• update the service state of the query task service for each of the service states that satisfies the query filter;
• and
• send a notification to a plurality of subscribers of the query task service in response to each update to the service state of the query task service.

A non-transitory computer readable medium comprising instructions, which when executed in a computer system, causes the computer system to carry out a method of providing notifications in a control plane of a computer system, comprising:

• executing a service host process of the control plane on a software platform of the computer system, the service host process managing services of the control plane and a persistent document store that stores service states for the services;
• creating a query task service of the control plane in addition to the services, a service state of the query task service including a query filter;
• evaluating each service state of the services against the query filter as each service state of the services is added to the persistent document store;
• updating the service state of the query task service for each of the service states that satisfies the query filter;
• and
• sending a notification to a plurality of subscribers of the query task service in response to each update to the service state of the query task service.