No label suggestions were being returned for multi-line aggregation
contexts because the parsed selector string does not see the full
context before a `by` or `without` clause.

This solution stitches together all text nodes that comprise the query
editor to ensure the selector has sufficient context to generate
suggestions.

Also, an additional workaround has been included to ensure range vector
syntax does not disrupt label suggestions in aggregation contexts.

Related: #12890

Explore: move suggestions logic to datasource language provider

[skip ci]

mysql: fix timeFilter macro should respect local time zone

use default region to call DescribeRegions

support template variable in stat field

docs: improve ES provisioning examples

Fix megacheck issues

closes #12281

[skip ci]

fix panel solo size

Fix doc error for DingDIng alert

Update the regex-matching in templateSrv to work with the new variabl…

Fix cannot receive dingding alert when alert message is empty

[skip ci]

[skip ci]

[skip ci]

Delete provisioning meta data when deleting Folder

prior to this fix Grafana didnt delete meta data
about the provisioned dashboard in `dashboard_provisioning`
which means that the dashboard wasn't inserted into
Grafana again if the folder was delete within Grafana.

closes #13280

Update the regex-matching in templateSrv to work with the new variable-syntax and be more flexible to regex-changes #13804

Explore: fix graph resize on window resize

[skip ci]

[skip ci]