Release notes for Grafana 8.2.2

Annotations: We have improved tag search performance. #40567, @ashharrison90
Application: You can now configure an error-template title. #40310, @benrubson
AzureMonitor: We removed a restriction from the resource filter query. #40690, @andresmgot
Caching: Make cache size metric collection optional. (Enterprise)
Packaging: We removed the ProcSubset option in systemd. This option prevented Grafana from starting in LXC environments. #40339, @kminehart
Prometheus: We removed the autocomplete limit for metrics. #39363, @ivanahuckova
Request interceptor: Allow MSSQL’s named instances. (Enterprise)
Table: We improved the styling of the type icons to make them more distinct from column / field name. #40596, @torkelo
ValueMappings: You can now use value mapping in stat, gauge, bar gauge, and pie chart visualizations. #40612, @torkelo

Alerting: Fix panic when Slack’s API sends unexpected response. #40721, @santihernandezc
Alerting: The Create Alert button now appears on the dashboard panel when you are working with a default datasource. #40334, @domasx2
Explore: We fixed the problem where the Explore log panel disappears when an Elasticsearch logs query returns no results. #40217, @Elfo404
Graph: You can now see annotation descriptions on hover. #40581, @axelavargas
Logs: The system now uses the JSON parser only if the line is parsed to an object. #40507, @ivanahuckova
Prometheus: We fixed the issue where the system did not reuse TCP connections when querying from Grafana Alerting. #40349, @kminehart
Prometheus: We fixed the problem that resulted in an error when a user created a query with a $__interval min step. #40525, @ivanahuckova
RowsToFields: We fixed the issue where the system was not properly interpreting number values. #40580, @torkelo
Scale: We fixed how the system handles NaN percent when data min = data max. #40622, @torkelo
Table panel: You can now create a filter that includes special characters. #40458, @dprokop