Adds support for collecting metrics from backend plugins and 
exposing them thru Grafana's Prometheus metrics endpoint. 
Enables to check health of backend plugin by using the route
`/api/plugins/<plugin id>/health`.
Uses sdk v0.6.0.

Closes #20984

By rotating the auth tokens at the end of the request we ensure
that there is minimum delay between a new token being generated
and the client receiving it.
Adds auth token slow load test which uses random latency for all 
tsdb queries..
Cleans up datasource proxy response handling.
DefaultHandler in middleware tests should write a response, the 
responseWriter BeforeFuncs wont get executed unless a response
is written.

Fixes #18644 

Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>

* Adding className to hide tabs on small screens

* update snapshot

* Readd border on pageheader

* update snap

#21350 introduced a bug regarding import of plugin dashboards. 
This should fix this and add custom validation if not importing 
plugin dashboard and dashboard property is missing.

Ref #21350

Co-Authored-By: Arve Knudsen <arve.knudsen@gmail.com>

* SideMenu: Fixes issue with logout link opened in new tab

* Updated snapshot

Breaking change: If disabled the cookie samesite cookie attribute
will not be set, but if none the attribute will be set and is a
breaking change compared to before where none did not render the
attribute. This was due to a known issue in Safari.

Co-Authored-By: Arve Knudsen <arve.knudsen@gmail.com>
Co-Authored-By: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

Fixes #19847

Adds basic alerting notification tests. First steps towards 
getting #18011 merged.

Ref #18011

* ImportDashboardCommand: Validate JSON fields

* add build-docs-website job to circleci

* update commands

* update readme command

* remove container when test finishes

* move build-docs-website to build-branches-and-prs

* update readme

* Fixed so when clicking a plot on a touch device we won't display the annotation context menue.

* Refactorings after feedback.

* changed to standard-ish comment.

* add common backend

* use const for range

* likely not differnt

* send the right orgId

* Add DataSourceWithBackend to @grafana/runtime mock in root reducer test

Co-authored-by: Dominik Prokop <dominik.prokop@grafana.com>

* add min_interval_seconds setting to alerting config

It will let operator enforce a minimum time for the scheduler to enqueue evaluations

* Introduce UI modifications

* Update docs

Co-authored-by: Martin <uepoch@users.noreply.github.com>

* replace select with tabs

* storybook example

* Update snapshot, move styles to component files

* Update rpm.md

* Update rpm.md

* Moved content to troubleshooting

Updated rpm.md and moved content from rpm.md to troubleshooting.md

* Update rpm.md

* Update rpm.md

* Update rpm.md

* Update rpm.md

* Update rpm.md

* Update rpm.md

* Update rpm.md

* Update docs/sources/installation/rpm.md

Co-Authored-By: Dan Cech <dcech@grafana.com>

* Update docs/sources/installation/rpm.md

Co-Authored-By: Dan Cech <dcech@grafana.com>

Co-authored-by: Dan Cech <dan@aussiedan.com>

OpsGenie's model works heavily off of the priority of an alert, 
e.g. routing and escalation. Currently this plugin only supports 
the default "P3".
Setting a tag og_priority to the correct P-value, e.g. P1, P2, P3, 
P4 or P5, will call the OpsGenie API with the correct priority value 
set.

Add fallbackText to Google Chat notifications. 
Definition of fallbackText: A plain-text description of the message's 
cards, used when the actual cards cannot be displayed, 
e.g. mobile notifications.

Fixes #21463

Moves backend plugin manager to service instead of
global functions in backendplugin package.

Closes #20053

Moves the details of loading plugins into the backend
plugin manager from the respective plugin (datasource,
transform and renderer).

* admin: user page to react WIP

* admin user page: basic view

* admin user page: refactor, extract orgs and permissions components

* admin user: change sessions actions styles

* admin user: add disable button

* user admin: add change grafana admin action

* user admin: able to change org role and remove org

* user admin: confirm force logout

* user admin: change org button style

* user admin: add confirm modals for critical actions

* user admin: lock down ldap user info

* user admin: align with latest design changes

* user admin: add LDAP sync

* admin user: confirm button

* user admin: add to org modal

* user admin: fix ConfirmButton story

* admin user: handle grafana admin change

* ConfirmButton: make styled component

* ConfirmButton: completely styled component

* User Admin: permissions section refactor

* admin user: refactor (orgs and sessions)

* ConfirmButton: able to set confirm variant

* admin user: inline org removal

* admin user: show ldap sync info only for ldap users

* admin user: edit profile

* ConfirmButton: some fixes after review

* Chore: fix storybook build

* admin user: rename handlers

* admin user: remove LdapUserPage import from routes

* Chore: fix ConfirmButton tests

* Chore: fix user api endpoint tests

* Chore: update failed test snapshots

* admin user: redux actions WIP

* admin user: use new ConfirmModal component for user profile

* admin user: use new ConfirmModal component for sessions

* admin user: use lockMessage

* ConfirmButton: use primary button as default

* admin user: fix ActionButton color

* UI: use Icon component for Modal

* UI: refactor ConfirmModal after Modal changes

* UI: add link button variant

* UI: able to use custom ConfirmButton

* Chore: fix type errors after ConfirmButton refactor

* Chore: revert Graph component changes (works with TS 3.7)

* Chore: use Forms.Button instead of ActionButton

* admin user: align items

* admin user: align add to org modal

* UI: organization picker component

* admin user: use org picker for AddToOrgModal

* admin user: org actions

* admin user: connect sessions actions

* admin user: updateUserPermissions action

* admin user: enable delete user action

* admin user: sync ldap user

* Chore: refactor, remove unused code

* Chore: refactor, move api calls to actions

* admin user: set user password action

* Chore: refactor, remove unused components

* admin user: set input focus on edit

* admin user: pass user into debug LDAP mapping

* UserAdminPage: Ux changes

* UserAdminPage: align buttons to the left

* UserAdminPage: align delete user button

* UserAdminPage: swap add to org modal buttons

* UserAdminPage: set password field to empty when editing

* UserAdminPage: fix tests

* Updated button border

* Chore: fix ConfirmButton after changes introduced in #21092

Co-authored-by: Torkel Ödegaard <torkel@grafana.com>

* Update cli.md

* update links

Co-authored-by: Robby Milo <robbymilo@gmail.com>

* revert back to i element

* snap

* add typings

* introduce tyings and refactor accordingly

* extract setting celltype

* update tests to reflect changes

* removing unused things

* renaming getCellType -> getCellDisplayType

* fix width type error

* remove caret

* move cell back to utils, fix story

* remove unused import

* rename type

* Login: Refactoring how login background is rendered

* Tweak

* refactoring BigValue layout to use polymorphism

* Renamed file

* StatPanel: Fixed min & max handling, white theme background

* Typescript and test fixes

* Fixed justify center logic

* Updated test dashboard

* Updated test dashboard

* Adjust time xMax to align with last data point if it's close

* Fixed color issue

* removed text shadow

* Removed unused stuff

* Fixed auto min max

* Fixed strict typescript issues

* Updated

* Refactor: Adds Redux Toolkit package

* Refactor: Uses configureStore from Redux Toolkit

* Refactor: Migrates applicationReducer

* Refactor: Migrates appNotificationsReducer

* Refactor: Migrates locationReducer

* Refactor: Migrates navModelReducer

* Refactor: Migrates teamsReducer and teamReducer

* Refactor: Migrates cleanUpAction

* Refactor: Migrates alertRulesReducer

* Refactor: Cleans up recursiveCleanState

* Refactor: Switched to Angular compatible reducers

* Refactor: Migrates folderReducer

* Refactor: Migrates dashboardReducer

* Migrates panelEditorReducer

* Refactor: Migrates dataSourcesReducer

* Refactor: Migrates usersReducer

* Refactor: Migrates organizationReducer

* Refactor: Migrates pluginsReducer

* Refactor: Migrates ldapReducer and ldapUserReducer

* Refactor: Migrates apiKeysReducer

* Refactor: Migrates exploreReducer and itemReducer

* Refactor: Removes actionCreatorFactory and reducerFactory

* Refactor: Moves mocks to test section

* Docs: Removes sections about home grown framework

* Update contribute/style-guides/redux.md

Co-Authored-By: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

* Refactor: Cleans up some code

* Refactor: Adds state typings

* Refactor: Cleans up typings

* Refactor: Adds comment about ImmerJs autoFreeze

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

* Refactoring to get the correct spacing between the first icon and button border.

* Should not be smaller then 8px to the left.

* Removed unused dependency.

* Updated snapshot for LinkButton.

* Update documentation-style-guide.md

Added Commands and code section.

* Update documentation-style-guide.md

* Update documentation-style-guide.md

Added code block examples

* Update documentation-style-guide.md

* remove anon funcs, removed options from state, removed update method, static selects as constants

* cancellable promise

* cancel promise on unmount

* use new datasource funcs for dryer component

* event handler funcs

* updated funcs and moved to utils, updating config editors

* S has no keys. never will never work

* remove report json

* update azure snapshot

* DataSourceSettings keyof

* rename reset funcs

* Update plugin docs

* Updated plugins installation documentation

Moved all Grafana CLI commands into cli.md, moved API script into user.md, rewrote installation.md as an actual task that refers the user to the plugins installation page

* Update cli.md

* Update cli.md

* Update docs/sources/administration/cli.md

Co-Authored-By: Dan Cech <dcech@grafana.com>

* Update docs/sources/administration/cli.md

Co-Authored-By: Dan Cech <dcech@grafana.com>

* Update docs/sources/http_api/user.md

Co-Authored-By: Dan Cech <dcech@grafana.com>

* Update docs/sources/http_api/user.md

Co-Authored-By: Dan Cech <dcech@grafana.com>

* Update cli.md

* Fixed links

* Update cli.md

* Update cli.md

* Update cli.md

* Update cli.md

Co-authored-by: Dan Cech <dan@aussiedan.com>

* Docs: Update debian.md

Simplified the APT install instructions by bundling the commands into one block, added steps in the .deb instructions to refer to new fields on the installation page.

* Update debian.md

* Update debian.md

* Update debian.md

* Update debian.md

* Update debian.md

* Update debian.md

Alerting: Adds support for sending a single email to all recipients in notification channel (#21091)

When an alert is sent by e-mail, the process sends an e-mail to 
each recipient separately. This PR is a single delivery to all recipients.
For companies that use e-mail extensively, this is necessary in order 
not to overload the sending queue.

Replaces #18013
Fixes #12650

Co-authored-by: Henrique Oliveira <holiiveira@users.noreply.github.com>

* Settings: supports env overrrides for dynamic settings

* Settings: makes it possible to explicitly get env override support for dynamic settings

* Make linter happy

* Refactor redirect_to cookie with secure flag in middleware

* Refactor redirect_to cookie with secure flag in api/login

* Refactor redirect_to cookie with secure flag in api/login_oauth

* Removed the deletion of 'Set-Cookie' header to prevent logout

* Removed the deletion of 'Set-Cookie' at top of api/login.go

* Add HttpOnly flag on redirect_to cookies where missing

* Refactor duplicated code

* Add tests

* Refactor cookie options

* Replace local function for deleting cookie

* Delete redundant calls

Co-authored-by: Sofia Papagiannaki <papagian@users.noreply.github.com>

* Logs: Fix parsing for logfmt fields that have parens

- added `()`, `[]`, and `{}` to be allowed in logfmt field names

* Fix matcher

Besides minor language corrections, this tries in particular to
provide some clarity about the `step` setting in the Prometheus range
query and the `$__interval` variable:

- First of all: They are both always the same.

- What's really confusing (and arguably really un-helpful) is that the
  _Min time interval_ is multiplied by the resolution
  factor. Therefore, I just state the fact here now but don't add
  anything like "This should be the scrape interval" because it is not
  true (if resolution is `1/10`, a meaningful _Min time interval_ is
  generally a tenth of the scrape interval).

- More helpful is the _Min step_ parameter, because it is not
  multiplied by the resolution factor (which I have now stated
  explicitly). Of course, the _Min time interval_ has to be set to
  something small so that the _Min step_ parameter can kick in.

It would be good if we could also override the _Min time interval_
tool tip because that is where most people will look, and the current,
very Graphite-centric tool tip is very confusing for the Prometheus
query editor, in particular because it doesn't have any hint about the
resolution factor being applied. See #21413.

Signed-off-by: beorn7 <beorn@grafana.com>