[EPIC] `1.10` Deprecations + Improved Developer Experience

[QMalcolm]

There are a number of unstrict areas of core which lead to confusion unexpected behaviors when developing their projects. Additionally, some of these unstrict areas make it difficult to make changes in core to add new features. As such, we want to make these unstrict areas strict, to do so we will be deprecating the unstrictness in a number of areas for core 1.10. Deprecating these things means they will continue to work in 1.10, but will not in later versions of core.

Things to deprecate

• [CT-520] [Enhancement] Schema files with repeated top level keys (e.g. models) results in only the last key being parsed #5114
• Deprecated Unexpected Jinja Blocks #11393
• deprecation warning for duplicate keys in YAML files #11296
• deprecate dbt source freshness --output, -o flag #11559
• put jsonschema validations behind a gate #11577
• deprecate extra whitespace in version: 2 YAML block #11565
• Feature Request: Strictness on arguments passed to config #2606
• [bug] do NOT allow users to define incomplete freshness config at different places and try to resolve them #11669
• [Bug] new config.freshness throws error when explicitly set to null #11685
• Deprecation include/exclude terminology for warn-error-options #11557
• move loaded_at_field and loaded_at_query under config #11659
• meta and tags should be configs under columns: (not properties) #11651
• deprecate --models, -m flag #11561
• Deprecate invalid properties under unused configuration paths #11339
• Deprecate unconstrained user space of environment variables #11340
• Deprecate logical operation without parentheses being piped into as_bool #11394
• consolidate CLI flags for --resource-type(s) (only singular now) #11560
• deprecate target_schema + target_database for snapshot legacy configs #11562
• deprecate entire context jinja variable #11564
• deprecate allowing extra colon at the end of a generic test definition #11563
• begin happy path testing jsonschema validations #11581
• Deprecate {{ modules.itertools }} #11725
• error on nesting quote characters directly within identifiers #11726
• validate config from .sql files #11727
• deprecate overrides source property #11566

Things that can be caught via JSONSchema

• Deprecate user provided custom top level attributes on nodes #11336
• Deprecate custom config keys (all non dbt controlled configs should live in meta within config) #11337
• Deprecate custom top level properties in YAML files #11338
• Generic jsonschema validation error handling from dbt_project.yml #11503
• Generic resource yaml jsonschema validation error handling #11504
• [BUG] Sometimes the CustomKeyInConfigDeprecation deprecation is fired with the wrong key information #11576
• move freshness under config so you can configure defaults for all sources / models #11506
• [CT-3289] [Feature] Common misspellings of Configs Are Silently Ignored - they should raise warnings  #8942
• group.owners and exposure.owners should ONLY support name and email, NO additional properties #11652
• Only allow + syntax for config setting in dbt_project.yml #11558

Warn Error Options Imporvements

• [Bug] --warn-error-options doesn't support configuration of turning source freshness warnings into failures #11116
• Ability to set deprecations as a group option of warn_error_options dbt-common#265

Adding support for meta config everywhere

• [Bug] Add support for setting tags and meta for exposures in dbt_project.yml #11428
• [Feature] Allow for groups to have a description and/or meta field #11319
• [Bug] analyses should support project-level configuration #11427
• make sure analyses support config meta
• make sure macros support config meta
• make sure exposures support config meta

Deprecation improvements

• Improve deprecation warns to track and handle multiple invocations #11429
• Emit single deprecations summary event #11536
• enhance deprecations module to allow for emitting preliminary/unfinalized/preview at info level #11597
• [Feature] Allow the event tag helpers to optionally included the event name dbt-common#281
• Flip flag for source_freshness_run_project_hooks #11609
• Gate running jsonschemas validations/deprecations based on a list of adapters supported by the jsonschemas #11680
• indicate whether a deprecation is from a package or the root project
• Behavior flag to show event name in normal logs #11471
• Prevent overcounting PropertyMovedToConfigDeprecation for source freshness #11660
• Flip flag for require_resource_names_without_spaces #11610

[graciegoheen]

[jeremyyeo]

2 additional false flags:
#11602
#11603