## Summary
- Corrected some validation in observations and actions to use strings (in alignment with 'describe_state' methods.)
- Fixed bug where periodic agent would start on step 0 instead of on the configured start step
- Improved validations on network node adder
- Added database password to config schema of database service
- DNS client lookup no longer requires a DNS server address to be configured if the requested domain exists in the client cache
- DNS client can now inherit the parent node's DNS server address
## Test process
Unit tests and tests against the extension
## Checklist
- [X] PR is linked to a **work item**
- [X] **acceptance criteria** of linked ticket are met
- [X] performed **self-review** of the code
- [X] written **tests** for any new functionality added with this PR
- [ ] updated the **documentation** if this PR changes or adds functionality
- [ ] written/updated **design docs** if this PR implements new functionality
- [X] updated the **change log**
- [X] ran **pre-commit** checks for code style
- [ ] attended to any **TO-DOs** left in the code
#3029 - Add string-ip validator, improve validation, fix minor bugs in pulling schema data
Related work items: #3029
## Summary
*Replace this text with an explanation of what the changes are and how you implemented them. Can this impact any other parts of the codebase that we should keep in mind?*
## Test process
*How have you tested this (if applicable)?*
## Checklist
- [ ] PR is linked to a **work item**
- [ ] **acceptance criteria** of linked ticket are met
- [ ] performed **self-review** of the code
- [ ] written **tests** for any new functionality added with this PR
- [ ] updated the **documentation** if this PR changes or adds functionality
- [ ] written/updated **design docs** if this PR implements new functionality
- [ ] updated the **change log**
- [ ] ran **pre-commit** checks for code style
- [ ] attended to any **TO-DOs** left in the code
#2869 - fixes to agents and remove redundant prints
Related work items: #2869
## Summary
This PR is a follow-on from Charlie's two branches, one for agents and one for actions. This list of changes describes work done by both Charlie and myself
- Agents are now extensible
- Refactored observation manager, action manager, and reward function to inherit from BaseModel
- Added a config schema to observation manager, action manager, and reward function
- Streamlined the way agents are created from config
- Agent config no longer requires a dummy action space if the action space is empty, the same applies for observation space and reward function
- Actions are now extensible
- Actions now support a config schema, to allow yaml data validation and default parameter values
- Action parameters are no longer defined through IDs, instead meaningful data is expected directly in the action map
- Test and example YAMLs have been updated to match the new agent and action schemas, such as:
- Removed empty action spaces, observation spaces, or reward spaces for agent which didn't use them
- Relabeled action parameters to match the new action config schemas, and updated the values to no longer rely on indices
- Removed action space options which were previously used for assigning meaning to action space IDs
- Updated tests that don't use YAMLs to still use the new action and agent schemas
- I haven't checked the notebooks run and there's a couple places where find-and-replace issues persist. I will fix but we can start review in the meantime if you're bored
## Test process
unit test
## Checklist
- [X] PR is linked to a **work item**
- [ ] **acceptance criteria** of linked ticket are met
- [X] performed **self-review** of the code
- [X] written **tests** for any new functionality added with this PR
- [ ] updated the **documentation** if this PR changes or adds functionality
- [ ] written/updated **design docs** if this PR implements new functionality
- [X] updated the **change log**
- [X] ran **pre-commit** checks for code style
- [ ] attended to any **TO-DOs** left in the code
Related work items: #2869, #2912
## Summary
These changes align core software with the approach that support extensions.
## Test process
Passes test suite.
## Checklist
- [X] PR is linked to a **work item**
- [X] **acceptance criteria** of linked ticket are met
- [X] performed **self-review** of the code
- [X] written **tests** for any new functionality added with this PR
- [ ] updated the **documentation** if this PR changes or adds functionality
- [ ] written/updated **design docs** if this PR implements new functionality
- [ ] updated the **change log**
- [X] ran **pre-commit** checks for code style
- [ ] attended to any **TO-DOs** left in the code
Related work items: #2888
