Release notes for Grafana 7.4.1

Influx: Make max series limit configurable and show the limiting message if applied. #31025, @aocenas
Make value mappings correctly interpret numeric-like strings. #30893, @dprokop
Variables: Adds queryparam formatting option. #30858, @hugohaggmark

Alerting: Fixes so notification channels are properly deleted. #31040, @hugohaggmark
BarGauge: Improvements to value sizing and table inner width calculations. #30990, @torkelo
DashboardLinks: Fixes crash when link has no title. #31008, @hugohaggmark
Elasticsearch: Fix alias field value not being shown in query editor. #30992, @Elfo404
Elasticsearch: Fix log row context errors. #31088, @Elfo404
Elasticsearch: Show Size setting for raw_data metric. #30980, @Elfo404
Graph: Fixes so graph is shown for non numeric time values. #30972, @hugohaggmark
Logging: Ignore ‘file already closed’ error when closing file. #31119, @aknuds1
Plugins: Fix plugin signature validation for manifest v2 on Windows. #31045, @wbrowne
TextPanel: Fixes so panel title is updated when variables change. #30884, @hugohaggmark
Transforms: Fixes Outer join issue with duplicate field names not getting the same unique field names as before. #31121, @torkelo