Meltano

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New

- [2545](https://gitlab.com/meltano/meltano/-/issues/2545) Add support for Python 3.9
- [2849](https://gitlab.com/meltano/meltano/-/issues/2849) Use dbt [`v0.20`](https://github.com/fishtown-analytics/dbt/releases/tag/v0.20.1) by default for new dbt installs
- [2576](https://gitlab.com/meltano/meltano/-/issues/2576) Use Airflow [v2.1](https://airflow.apache.org/docs/apache-airflow/2.1.0/changelog.html) by default for new Airflow installs
- [2871](https://gitlab.com/meltano/meltano/-/issues/2871) Add `discovery_url_auth` project setting to support authenticated retrieval of `discovery.yml`
- [2855](https://gitlab.com/meltano/meltano/-/issues/2855) Allow `executable` to be overridden through plugin inheritance
- [2860](https://gitlab.com/meltano/meltano/-/issues/2860) Allow commands to use alternate executables

Changes

- [2868](https://gitlab.com/meltano/meltano/-/issues/2868) Refactor to allow SingerTarget to inject a BookmarkWriter via a new PluginInvoker callback
- [2575](https://gitlab.com/meltano/meltano/-/issues/2575) Support version-specific pip constraint files by allowing the special var `${MELTANO__PYTHON_VERSION}` in plugin pip_url's (bumps `discovery.yml` version ([#2890](https://gitlab.com/meltano/meltano/-/issues/2890)) to signal the required upgrade)

Fixes

- [2882](https://gitlab.com/meltano/meltano/-/issues/2882) Allow multiple taps / targets to be invoked at the same time by adding a UUID to config.json
- [2381](https://gitlab.com/meltano/meltano/-/issues/2381) Implement selection logic for all Singer discoverable metadata (`inclusion` and `selected-by-default`)

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New

- [2814](https://gitlab.com/meltano/meltano/-/issues/2814) Add `mashey` variant of `tap-ask-nicely`
- [2815](https://gitlab.com/meltano/meltano/-/issues/2815) Add `singer-io` variant of `tap-github`
- [2816](https://gitlab.com/meltano/meltano/-/issues/2816) Add `singer-io` variant of `tap-google-sheets`
- [2817](https://gitlab.com/meltano/meltano/-/issues/2817) Add `singer-io` variant of `tap-pendo`
- [2818](https://gitlab.com/meltano/meltano/-/issues/2818) Add `singer-io` variant of `tap-hubspot`
- [2821](https://gitlab.com/meltano/meltano/-/issues/2821) Add `singer-io` variant of `tap-jira`
- [2823](https://gitlab.com/meltano/meltano/-/issues/2823) Add `transferwise` variant of `tap-twilio`

Fixes

- [2951](https://gitlab.com/meltano/meltano/-/issues/2851) Default to skipping transforms in Meltano UI pipeline creation
- [2758](https://gitlab.com/meltano/meltano/-/issues/2758) Fix misleading error message when calling `meltano invoke airflow <args>`
- [2826](https://gitlab.com/meltano/meltano/-/issues/2826) Make plugin installation serial during `meltano add ...`
- [2828](https://gitlab.com/meltano/meltano/-/issues/2828) Fix coroutine error when `python3-venv` is missing during plugin installation.

Breaks

---

Changes

- [2694](https://gitlab.com/meltano/meltano/-/issues/2694) Use dbt [`v0.19.1`](https://github.com/fishtown-analytics/dbt/releases/tag/v0.19.1) by default for new dbt installs
- [2694](https://gitlab.com/meltano/meltano/-/issues/2694) Add support for dbt [`config-version: 2`](https://docs.getdbt.com/docs/guides/migration-guide/upgrading-to-0-17-0)
- [2622](https://gitlab.com/meltano/meltano/-/issues/2622) Make `hotgluexyz` the default variant for the CSV loader

Fixes

- [2741](https://gitlab.com/meltano/meltano/-/issues/2741) Fix duplication of config values when complex settings are applied to Singer plugins.

---

Fixes

- [2755](https://gitlab.com/meltano/meltano/-/issues/2755) Fix SQLAlchemy `cache_ok` warning messages when running `meltano elt`
- [2773](https://gitlab.com/meltano/meltano/-/issues/2773) Fix `tap-chargebee`, `tap-intacct` and `tap-quickbooks` definitions that had `properties` capability instead of `catalog`
- [2784](https://gitlab.com/meltano/meltano/-/issues/2784) Fix catalog discovery error when using custom plugins with no `pip_url` set

---

Changes

- [2745](https://gitlab.com/meltano/meltano/-/issues/2745) Allow `meltano` commands to be used from a subdirectory of a project
- [2341](https://gitlab.com/meltano/meltano/-/issues/2341) Add support for already-installed plugins by making `pip_url` optional in custom plugin definitions
- [2341](https://gitlab.com/meltano/meltano/-/issues/2341) Allow non-pip plugins to be declared using relative `executable` paths and `executable` programs already on the PATH

---

New

- [2353](https://gitlab.com/meltano/meltano/-/issues/2353) Add `meltano remove` command