Explore: label selector for logging

Fix #13356, where tooltips do not display individual values on stacked graphs

render proper values for individual points

Fix metric-segment options displaying after blur

options displays after blur

Update Configuration.md

added span with folder title that is shown for recently and starred

Fix misspell issues

This is a typo in
https://github.com/grafana/grafana/blob/master/public/app/core/utils/kbn.ts#L1051

See,
$ codespell -S "./.git*,./vendor*,./public*"

See,
$ gometalinter --disable-all --enable misspell --deadline 10m --vendor ./...
pkg/api/dtos/alerting_test.go:32:13:warning: "expectes" is a misspelling of "expects" (misspell)
pkg/api/static/static.go:2:18:warning: "Unknwon" is a misspelling of "Unknown" (misspell)
pkg/components/imguploader/azureblobuploader.go:55:48:warning: "conatiner" is a misspelling of "container" (misspell)
pkg/login/ldap_settings.go:51:115:warning: "compatability" is a misspelling of "compatibility" (misspell)
pkg/middleware/auth_proxy_test.go:122:22:warning: "Destory" is a misspelling of "Destroy" (misspell)
pkg/middleware/logger.go:2:18:warning: "Unknwon" is a misspelling of "Unknown" (misspell)
pkg/services/notifications/codes.go:9:13:warning: "Unknwon" is a misspelling of "Unknown" (misspell)
pkg/services/session/mysql.go:170:3:warning: "Destory" is a misspelling of "Destroy" (misspell)
pkg/services/session/mysql.go:171:24:warning: "Destory" is a misspelling of "Destroy" (misspell)
pkg/services/session/session.go:95:4:warning: "Destory" is a misspelling of "Destroy" (misspell)
pkg/services/session/session.go:96:1:warning: "Destory" is a misspelling of "Destroy" (misspell)
pkg/services/session/session.go:167:25:warning: "Destory" is a misspelling of "Destroy" (misspell)
pkg/setting/setting.go:1:18:warning: "Unknwon" is a misspelling of "Unknown" (misspell)
pkg/tsdb/cloudwatch/cloudwatch.go:199:14:warning: "resolutin" is a misspelling of "resolutions" (misspell)
pkg/tsdb/cloudwatch/cloudwatch.go:270:15:warning: "resolutin" is a misspelling of "resolutions" (misspell)
pkg/tsdb/elasticsearch/response_parser.go:531:24:warning: "Unkown" is a misspelling of "Unknown" (misspell)
pkg/tsdb/elasticsearch/client/search_request.go:113:7:warning: "initaite" is a misspelling of "initiate" (misspell)

Note: Unknwon is a library name, and Destory a mysql typo.

Explore: Fix label suggestions for recording rules

Fix megacheck issues

$ gometalinter --vendor --disable-all --enable=megacheck --disable=gotype --deadline=6m ./...
pkg/tracing/tracing.go:81:25:warning: cfg.New is deprecated: use NewTracer() function  (SA1019) (megacheck)

$ gometalinter --vendor --disable-all --enable=megacheck --disable=gotype --deadline=6m ./...
pkg/services/sqlstore/user.go:274:3:warning: empty branch (SA9003) (megacheck)

$ gometalinter --vendor --disable-all --enable=megacheck --disable=gotype --deadline=6m ./...
pkg/tsdb/elasticsearch/response_parser.go:95:41:warning: should use make(map[string]string) instead (S1019) (megacheck)
pkg/tsdb/elasticsearch/response_parser.go:125:41:warning: should use make(map[string]string) instead (S1019) (megacheck)
pkg/tsdb/elasticsearch/response_parser.go:317:5:warning: redundant break statement (S1023) (megacheck)
pkg/tsdb/elasticsearch/response_parser.go:358:5:warning: redundant break statement (S1023) (megacheck)

append.

$ gometalinter --vendor --disable-all --enable=megacheck --disable=gotype --deadline=6m ./...
pkg/tsdb/elasticsearch/client/search_request.go:59:4:warning: should replace loop with sr.Aggs = append(sr.Aggs, aggArray...) (S1011) (megacheck)
pkg/tsdb/elasticsearch/client/search_request.go:303:4:warning: should replace loop with agg.Aggregation.Aggs = append(agg.Aggregation.Aggs, childAggs...) (S1011) (megacheck)

Explore: Query field fixes

Fix misspelled authentication in Auth overview doc

Don't use unnest in queries for redshift compatibility

Explore: Fix click to filter for recording rule expressions

- parsing of recording rules failed for label suggestor
- added ':' to parsing routine

- recording rule names contain ':'
- include this in the pattern for metric names

Fix megacheck issues

$ gometalinter --vendor --disable=all --enable=megacheck --deadline=10m ./...
pkg/tsdb/elasticsearch/client/client.go:147:13:warning: should use time.Since instead of time.Now().Sub (S1012) (megacheck)
pkg/tsdb/elasticsearch/client/client.go:190:14:warning: should use time.Since instead of time.Now().Sub (S1012) (megacheck)
pkg/tsdb/elasticsearch/client/client.go:218:13:warning: should use time.Since instead of time.Now().Sub (S1012) (megacheck)

$ gometalinter --vendor --disable=all --enable=megacheck --deadline=10m ./...
pkg/plugins/dashboards_updater.go:51:2:warning: 'if err != nil { return err }; return nil' can be simplified to 'return err' (S1013) (megacheck)

$ gometalinter --vendor --disable=all --enable=megacheck --deadline=10m ./...
pkg/services/sqlstore/alert_notification.go:242:3:warning: 'if err != nil { return err }; return nil' can be simplified to 'return err' (S1013) (megacheck)

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