See,
$ gometalinter --vendor --deadline 6m --disable-all --enable=megacheck ./...
pkg/tsdb/mssql/mssql_test.go:695:33:warning: do not pass a nil Context, even if a function permits it; pass context.TODO if you are unsure about which Context to use (SA1012) (megacheck)
pkg/tsdb/mysql/mysql_test.go:772:32:warning: do not pass a nil Context, even if a function permits it; pass context.TODO if you are unsure about which Context to use (SA1012) (megacheck)
pkg/tsdb/postgres/postgres_test.go:704:33:warning: do not pass a nil Context, even if a function permits it; pass context.TODO if you are unsure about which Context to use (SA1012) (megacheck)

stackdriver docs: metric query editor and annotations

- index page datasource order changed
- image links changed to the image box format
- incorrect sentence fixed

Frontend extensions

[skip ci]

fix phantomjs render of graph panel when legend displayed as table to the right

Adding loading spinner to org pages

[skip ci]

elasticsearch: fix no limit size in terms aggregation for alerting queries

bug fix

fix alert no data when elasticsearch group by terms size is set to no limit

[skip ci]

Run queries for sql data sources for panels with multiple queries concurrently
Also make max open connections, max idle connections and max connection 
lifetime configurable in the data source settings

Explore: highlight typed text in suggestions

wip: whats new for 5.3

Plus a few tweaks to the text

Update mac.md

Update windows.md

Update rpm.md

[skip ci]

[skip ci]

cloudwatch: automatically set graph yaxis unit 

fixes #13575