Log CM deprecated (#14018)

* log CM deprecated

* updated message

* cfgwarn

* changelog

* changelog

CHANGELOG.next.asciidoc

@@ -281,6 +281,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Use less restrictive API to check if template exists. {pull}13847[13847]
 - Do not check for alias when setup.ilm.check_exists is false. {pull}13848[13848]
 - Add support for numeric time zone offsets in timestamp processor. {pull}13902[13902]
+- Marking Central Management deprecated. {pull}14018[14018]
 
 *Auditbeat*
 

x-pack/libbeat/management/enroll.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/elastic/beats/libbeat/cfgfile"
 	"github.com/elastic/beats/libbeat/cmd/instance"
+	"github.com/elastic/beats/libbeat/common/cfgwarn"
 	"github.com/elastic/beats/libbeat/common/file"
 	"github.com/elastic/beats/libbeat/kibana"
 	"github.com/elastic/beats/x-pack/libbeat/management/api"
@@ -35,6 +36,8 @@ func Enroll(
 		return err
 	}
 
+	cfgwarn.Deprecate("8.0.0", "Central Management is no longer under development and has been deprecated. We are working hard to deliver a new and more comprehensive solution and look forward to sharing it with you")
+
 	accessToken, err := client.Enroll(beat.Info.Beat, beat.Info.Name, beat.Info.Version, beat.Info.Hostname, beat.Info.ID, enrollmentToken)
 	if err != nil {
 		return err

x-pack/libbeat/management/manager.go

@@ -65,6 +65,8 @@ func NewConfigManagerWithConfig(c *Config, registry *reload.Registry, beatUUID u
 	var blacklist *ConfigBlacklist
 
 	if c.Enabled {
+		cfgwarn.Deprecate("8.0.0", "Central Management is no longer under development and has been deprecated. We are working hard to deliver a new and more comprehensive solution and look forward to sharing it with you")
+
 		var err error
 
 		if err = validateConfig(c); err != nil {