Closes #19626

* Consolidate backend guidelines

* Fix link

* Fix review comments

for use with gel which is not released yet.

currently temporary separate http api

* Add data link from panel to cloudwatch console

* Change conf variable name

* Fixes according to pr feedback

* Cleanup. Fix broken tests

* Explore: Remove datasource testing on selector

- datasource testing gets in the way of fast query iteration: switching
between datasources can take seconds
- it should not be explore's duty to test datasources in the first place
- removed the concept of datasourceError in Explore, should not be its
concern
- datasource erorrs will express themselves in query errors just fine
- connection errors are still bubbled up
- removed reconnection logic from explore, should not be its concern
- missing labels in loki are still "visible" via an empty label selector
- Loki and Prometheus treated connection errors differently than other
datasources, making sure to pass through the original error message

* Show datasource error in query field for prom/loki/influx

* Removed connection test case, fixed disabled state

* Enable `errcheck` for golangci-lint
* Fix linting errors
* pkg/plugins: Fix tests
* pkg/plugins: Add test

fixes: #20039

Requests to endpoint will currently will error unless expressions feature flag is true.

Co-authored-by: Sofia Papagiannaki <papagian@gmail.com>

* Implement Label component

* Expose next-gen form components from grafana-ui under Forms namespace

* adding knobs to story, setting new variants and sizes

* handle next gen button in their own component

* removing duplication

* fix Thresholds test

* removing blank lines

* moving noUnusedLocals

* new button should not need theme

* remove not used export

* pseudo classes for focus state

* remove not used things

* use correct border radius

* extracting focus styles to commonStyles for reuse

* tidying up getButtonStyles

* Adding a few examples to the doc

* Adding props table

* Fix modal

* Fix test message

* WIP: Spawn backend plugins v2

* Add test for plugin version

* Fix support for SDK plugins

Co-authored-by: Kyle Brandt <kyle@kbrandt.com>
Co-authored-by: Marcus Olsson <olsson.e.marcus@gmail.com>
Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>

* WIP: Draft PR for fork of V2 sdk / bi-directional support (#19890)

* temporary use export-datasource-plugin branch of grafana-plugin-sdk

* fix failing test

* remove debug (spew) lines

* misc cleanup

* add expressions feature toggle

* use latest grafana-plugin-sdk-go

Docker: Build and use musl-based binaries in alpine images to resolve glibc incompatibility issues (#19798)

* build: Install musl cross compilers as part of build Docker image
* build: Build also musl packages in scripts/build/build.sh
* scripts/build/build-all.sh: Build musl Linux targets
* build: Upgrade build-container to 1.2.11
* build.go: De-duplicate code
* build: Base Docker images on musl binaries

* pkg/util: Check errors
* pkg/services: DRY up code

* display appEvent on load

* move to app.ts, create util and tests

* adding case for ie edge

* Updated browser notice text

* Making flowchart work

* Enable testEnvironment jest option

* Add babel-jest to grafana-toolkit

* Fix test

* Resolve either js or ts jest setup files

* Update packages/grafana-toolkit/src/config/jest.plugin.config.ts

* Update packages/grafana-toolkit/src/config/webpack.plugin.config.ts

* Implement Label component

* Expose next-gen form components from grafana-ui under Forms namespace

* Minor Label update

* Add Legend component

* Test form story

* Expose Legend class name via getFormStyles

* Test

* FieldValidationMessage spacing

* Expose FieldValidationMessage styles via getFormStyles

* Update snapshot

Check errors in pkg/models.

Check errors in pkg/setting.

Check errors in pkg/tsdb.

* Document Makefile

* Fix review comments

* Rename group to Services

* Fix review comments

* pkg/services: Check errors
* pkg/services: Don't treat context.Canceled|context.DeadlineExceeded as error

Logs the real (dynamic) HTTP port when configured 
Grafana using setting.HttpPort = 0.

Fixes #16709

* Make it clear that role switching is not supported

* Update docs/sources/features/datasources/cloudwatch.md

Co-Authored-By: Marcus Efraimsson <marcus.efraimsson@gmail.com>