Add verbose settings (#65469)

* Add `settings.CurrentVerbose` function

* Add function to retrieve verbose settings

* Add `/settings-verbose` endpoint

* Restrict the verbose source types

pkg/setting/provider.go

@@ -36,6 +36,9 @@ type Provider interface {
 	// the current configured pairs of key/values for each
 	// configuration section.
 	Current() SettingsBag
+
+	CurrentVerbose() VerboseSettingsBag
+
 	// Update receives a SettingsBag with the pairs of key/values
 	// to be updated per section and a SettingsRemovals with the
 	// section keys to be removed.
@@ -92,6 +95,14 @@ type ReloadHandler interface {
 type SettingsBag map[string]map[string]string
 type SettingsRemovals map[string][]string
 
+type VerboseSourceType string
+type VerboseSettingsBag map[string]map[string]map[VerboseSourceType]string
+
+const (
+	DB     VerboseSourceType = "db"
+	System VerboseSourceType = "system"
+)
+
 func ProvideProvider(cfg *Cfg) *OSSImpl {
 	return &OSSImpl{
 		Cfg: cfg,
@@ -102,7 +113,7 @@ type OSSImpl struct {
 	Cfg *Cfg
 }
 
-func (o OSSImpl) Current() SettingsBag {
+func (o *OSSImpl) Current() SettingsBag {
 	settingsCopy := make(SettingsBag)
 
 	for _, section := range o.Cfg.Raw.Sections() {
@@ -115,6 +126,10 @@ func (o OSSImpl) Current() SettingsBag {
 	return settingsCopy
 }
 
+func (o *OSSImpl) CurrentVerbose() VerboseSettingsBag {
+	return nil
+}
+
 func (OSSImpl) Update(SettingsBag, SettingsRemovals) error {
 	return errors.New("oss settings provider do not have support for settings updates")
 }
@@ -127,9 +142,9 @@ func (o *OSSImpl) Section(section string) Section {
 	return &sectionImpl{section: o.Cfg.Raw.Section(section)}
 }
 
-func (OSSImpl) RegisterReloadHandler(string, ReloadHandler) {}
+func (*OSSImpl) RegisterReloadHandler(string, ReloadHandler) {}
 
-func (o OSSImpl) IsFeatureToggleEnabled(name string) bool {
+func (o *OSSImpl) IsFeatureToggleEnabled(name string) bool {
 	return o.Cfg.IsFeatureToggleEnabled(name)
 }