comply with ECS for host.name and host.hostname (#168)

Upgrades go-sysinfo to v1.14.1, which does not lower-case the FQDN. As a result, `host.name` returned by `host.MapHostInfo` is now lower-cased to comply with [ECS](https://www.elastic.co/guide/en/ecs/current/ecs-host.html#field-host-name).

This change ensures the FQDN is not lower-cased by default and that `host.hostname`, when set to FQDN, reflects the FQDN as defined in the system.

NOTICE.txt

@@ -846,11 +846,11 @@ Contents of probable licence file $GOMODCACHE/github.com/elastic/go-structform@v
 
 --------------------------------------------------------------------------------
 Dependency : github.com/elastic/go-sysinfo
-Version: v1.14.0
+Version: v1.14.1
 Licence type (autodetected): Apache-2.0
 --------------------------------------------------------------------------------
 
-Contents of probable licence file $GOMODCACHE/github.com/elastic/[email protected].0/LICENSE.txt:
+Contents of probable licence file $GOMODCACHE/github.com/elastic/[email protected].1/LICENSE.txt:
 
 
                                  Apache License
@@ -1480,12 +1480,12 @@ limitations under the License.
 
 
 --------------------------------------------------------------------------------
-Dependency : github.com/gofrs/uuid
-Version: v4.4.0+incompatible
+Dependency : github.com/gofrs/uuid/v5
+Version: v5.2.0
 Licence type (autodetected): MIT
 --------------------------------------------------------------------------------
 
-Contents of probable licence file $GOMODCACHE/github.com/gofrs/uuid@v4.4.0+incompatible/LICENSE:
+Contents of probable licence file $GOMODCACHE/github.com/gofrs/uuid/[email protected]/LICENSE:
 
 Copyright (C) 2013-2018 by Maxim Bublis <[email protected]>
 
@@ -3243,6 +3243,36 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 
 
+--------------------------------------------------------------------------------
+Dependency : github.com/gofrs/uuid
+Version: v4.4.0+incompatible
+Licence type (autodetected): MIT
+--------------------------------------------------------------------------------
+
+Contents of probable licence file $GOMODCACHE/github.com/gofrs/[email protected]+incompatible/LICENSE:
+
+Copyright (C) 2013-2018 by Maxim Bublis <[email protected]>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
 --------------------------------------------------------------------------------
 Dependency : github.com/gogo/protobuf
 Version: v1.3.2

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/elastic/elastic-agent-libs v0.9.13
 	github.com/elastic/go-licenser v0.4.2
 	github.com/elastic/go-structform v0.0.9
-	github.com/elastic/go-sysinfo v1.14.0
+	github.com/elastic/go-sysinfo v1.14.1
 	github.com/elastic/go-windows v1.0.1
 	github.com/elastic/gosigar v0.14.2
 	github.com/gofrs/uuid/v5 v5.2.0

go.sum

@@ -23,8 +23,8 @@ github.com/elastic/go-licenser v0.4.2 h1:bPbGm8bUd8rxzSswFOqvQh1dAkKGkgAmrPxbUi+
 github.com/elastic/go-licenser v0.4.2/go.mod h1:W8eH6FaZDR8fQGm+7FnVa7MxI1b/6dAqxz+zPB8nm5c=
 github.com/elastic/go-structform v0.0.9 h1:HpcS7xljL4kSyUfDJ8cXTJC6rU5ChL1wYb6cx3HLD+o=
 github.com/elastic/go-structform v0.0.9/go.mod h1:CZWf9aIRYY5SuKSmOhtXScE5uQiLZNqAFnwKR4OrIM4=
-github.com/elastic/go-sysinfo v1.14.0 h1:dQRtiqLycoOOla7IflZg3aN213vqJmP0lpVpKQ9lUEY=
-github.com/elastic/go-sysinfo v1.14.0/go.mod h1:FKUXnZWhnYI0ueO7jhsGV3uQJ5hiz8OqM5b3oGyaRr8=
+github.com/elastic/go-sysinfo v1.14.1 h1:BpY/Utfz75oKSpsQnbAJmmlnT3gBV9WFsopBEYgjhZY=
+github.com/elastic/go-sysinfo v1.14.1/go.mod h1:FKUXnZWhnYI0ueO7jhsGV3uQJ5hiz8OqM5b3oGyaRr8=
 github.com/elastic/go-ucfg v0.8.8 h1:54KIF/2zFKfl0MzsSOCGOsZ3O2bnjFQJ0nDJcLhviyk=
 github.com/elastic/go-ucfg v0.8.8/go.mod h1:4E8mPOLSUV9hQ7sgLEJ4bvt0KhMuDJa8joDT2QGAEKA=
 github.com/elastic/go-windows v1.0.1 h1:AlYZOldA+UJ0/2nBuqWdo90GFCgG9xuyw9SYzGUtJm0=

metric/system/host/host.go

@@ -18,6 +18,8 @@
 package host
 
 import (
+	"strings"
+
 	"github.com/elastic/elastic-agent-libs/mapstr"
 	"github.com/elastic/elastic-agent-libs/monitoring"
 	"github.com/elastic/go-sysinfo"
@@ -33,7 +35,7 @@ func MapHostInfo(info types.HostInfo, fqdn string) mapstr.M {
 
 	data := mapstr.M{
 		"host": mapstr.M{
-			"name":         name,
+			"name":         strings.ToLower(name),
 			"hostname":     info.Hostname,
 			"architecture": info.Architecture,
 			"os": mapstr.M{

metric/system/host/host_test.go

@@ -46,7 +46,7 @@ func TestMapHostInfo(t *testing.T) {
 		Architecture:      "x86_64",
 		BootTime:          bootTime,
 		Containerized:     &containerized,
-		Hostname:          "foo",
+		Hostname:          "fOo",
 		IPs:               []string{"1.2.3.4", "192.168.1.1"},
 		KernelVersion:     "22.3.0",
 		MACs:              []string{"56:9c:17:54:19:15", "5c:e9:1e:c4:37:66"},
@@ -66,7 +66,7 @@ func TestMapHostInfo(t *testing.T) {
 				"host": mapstr.M{
 					"architecture":  "x86_64",
 					"containerized": true,
-					"hostname":      "foo",
+					"hostname":      "fOo",
 					"id":            "a39b4c1ee4",
 					"name":          "foo.bar.local",
 					"os": mapstr.M{
@@ -87,7 +87,7 @@ func TestMapHostInfo(t *testing.T) {
 				"host": mapstr.M{
 					"architecture":  "x86_64",
 					"containerized": true,
-					"hostname":      "foo",
+					"hostname":      "fOo",
 					"id":            "a39b4c1ee4",
 					"name":          "foo",
 					"os": mapstr.M{