AzureMonitor: Azure settings in Grafana server config (#33728)

* Azure cloud settings

* Fix typos

* Grouped Azure settings

* Doc fixes

* Some settings are not needed

* Updated cloud name aliases

pkg/setting/setting.go

@@ -284,6 +284,9 @@ type Cfg struct {
 	AWSAssumeRoleEnabled    bool
 	AWSListMetricsPageLimit int
 
+	// Azure Cloud settings
+	Azure AzureSettings
+
 	// Auth proxy settings
 	AuthProxyEnabled          bool
 	AuthProxyHeaderName       string
@@ -900,6 +903,7 @@ func (cfg *Cfg) Load(args *CommandLineArgs) error {
 
 	cfg.readLDAPConfig()
 	cfg.handleAWSConfig()
+	cfg.readAzureSettings()
 	cfg.readSessionConfig()
 	cfg.readSmtpSettings()
 	cfg.readQuotaSettings()

pkg/setting/setting_azure.go

@@ -0,0 +1,62 @@
+package setting
+
+import "strings"
+
+const (
+	AzurePublic       = "AzureCloud"
+	AzureChina        = "AzureChinaCloud"
+	AzureUSGovernment = "AzureUSGovernment"
+	AzureGermany      = "AzureGermanCloud"
+)
+
+type AzureSettings struct {
+	Cloud                   string
+	ManagedIdentityEnabled  bool
+	ManagedIdentityClientId string
+}
+
+func (cfg *Cfg) readAzureSettings() {
+	azureSection := cfg.Raw.Section("azure")
+
+	// Cloud
+	cloudName := azureSection.Key("cloud").MustString(AzurePublic)
+	cfg.Azure.Cloud = normalizeAzureCloud(cloudName)
+
+	// Managed Identity
+	cfg.Azure.ManagedIdentityEnabled = azureSection.Key("managed_identity_enabled").MustBool(false)
+	cfg.Azure.ManagedIdentityClientId = azureSection.Key("managed_identity_client_id").String()
+}
+
+func normalizeAzureCloud(cloudName string) string {
+	switch strings.ToLower(cloudName) {
+	// Public
+	case "azurecloud":
+	case "azurepublic":
+	case "azurepubliccloud":
+	case "public":
+		return AzurePublic
+
+	// China
+	case "azurechina":
+	case "azurechinacloud":
+	case "china":
+		return AzureChina
+
+	// US Government
+	case "azureusgovernment":
+	case "azureusgovernmentcloud":
+	case "usgov":
+	case "usgovernment":
+		return AzureUSGovernment
+
+	// Germany
+	case "azuregermancloud":
+	case "azuregermany":
+	case "german":
+	case "germany":
+		return AzureGermany
+	}
+
+	// Pass the name unchanged if it's not known
+	return cloudName
+}