Add-AzMetricAlertRuleV2 throw "Couldn't find a metric named..." - azure

Question

Description
I'm trying to create new Azure Monitor Alert using PS script.
I'm using MS documentation here:
https://learn.microsoft.com/en-us/powershell/module/az.monitor/add-azmetricalertrulev2?view=azps-5.9.0
Steps to reproduce
$condition = New-AzMetricAlertRuleV2Criteria -MetricName "SqlDbDtuUsageMetric" -MetricNameSpace "Microsoft.Sql/servers/databases" -TimeAggregation Average -Operator GreaterThan -Threshold 5
$act = New-AzActionGroup -ActionGroupId /subscriptions/{subscription_id}/resourceGroups/{resource_group}/providers/microsoft.insights/actionGroups/SqlDbDtuUsageAction
Add-AzMetricAlertRuleV2 -Name "SqlDbDtuUsageAlertGt5" -ResourceGroupName {resource_group} -WindowSize 00:05:00 -Frequency 00:05:00 -TargetResourceId "/subscriptions/{subscription_id}/resourceGroups/{resource_group}/providers/Microsoft.Sql/servers/{sql_server}/databases/vi{sql_db}" -Description "Alerting when max used DTU is > 20" -Severity 3 -ActionGroup $act -Condition $condition
Error output
WARNING: 09:04:18 - *** The namespace for all the model classes will change from Microsoft.Azure.Management.Monitor.Management.Models to Microsoft.Azure.Management.Monitor.Models in future releases.
WARNING: 09:04:18 - *** The namespace for output classes will be uniform for all classes in future releases to make it independent of modifications in the model classes.
VERBOSE: Performing the operation "Create/update an alert rule" on target "Create/update an alert rule: SqlDbDtuUsageAlertGt5 from resource group: vi-prod-be-cin-rg".
Add-AzMetricAlertRuleV2 : Exception type: ErrorResponseException, Message: Couldn't find a metric named metric1. Make sure the name is correct. Activity ID: 3e7e537e-43fc-40ad-8a84-745df33e1668., Code: BadRequest, Status code:BadRequest, Reason phrase: BadRequest
At line:1 char:1
Add-AzMetricAlertRuleV2 -Name "SqlDbDtuUsageAlertGt5" -ResourceGroupN ...
+ CategoryInfo : CloseError: (:) [Add-AzMetricAlertRuleV2], PSInvalidOperationException
+ FullyQualifiedErrorId : Microsoft.Azure.Commands.Insights.Alerts.AddAzureRmMetricAlertRuleV2Command
Module versions
Directory: C:\Program Files\WindowsPowerShell\Modules
ModuleType Version Name ExportedCommands
Script 2.2.5 Az.Accounts {Disable-AzDataCollection, Disable-AzContextAutosave, Enable-AzDataCollection, Enable-AzContextAutosave...}
Script 1.6.3 Az.Accounts {Disable-AzDataCollection, Disable-AzContextAutosave, Enable-AzDataCollection, Enable-AzContextAutosave...}
Script 1.0.1 Az.Advisor {Get-AzAdvisorRecommendation, Enable-AzAdvisorRecommendation, Disable-AzAdvisorRecommendation, Get-AzAdvisorConfiguration...}
Script 1.0.2 Az.Aks {Get-AzAks, New-AzAks, Remove-AzAks, Import-AzAksCredential...}
Script 1.1.1 Az.AnalysisServices {Resume-AzAnalysisServicesServer, Suspend-AzAnalysisServicesServer, Get-AzAnalysisServicesServer, Remove-AzAnalysisServicesServer...}
Script 1.3.2 Az.ApiManagement {Add-AzApiManagementApiToProduct, Add-AzApiManagementProductToGroup, Add-AzApiManagementRegion, Add-AzApiManagementUserToGroup...}
Script 1.0.2 Az.ApplicationInsights {Get-AzApplicationInsights, New-AzApplicationInsights, Remove-AzApplicationInsights, Set-AzApplicationInsightsPricingPlan...}
Script 1.3.4 Az.Automation {Get-AzAutomationHybridWorkerGroup, Remove-AzAutomationHybridWorkerGroup, Get-AzAutomationJobOutputRecord, Import-AzAutomationDscNodeConfiguration...}
Script 1.1.2 Az.Batch {Remove-AzBatchAccount, Get-AzBatchAccount, Get-AzBatchAccountKey, New-AzBatchAccount...}
Script 1.0.1 Az.Billing {Get-AzBillingInvoice, Get-AzBillingPeriod, Get-AzEnrollmentAccount, Get-AzConsumptionBudget...}
Script 1.3.1 Az.Cdn {Get-AzCdnProfile, Get-AzCdnProfileSsoUrl, New-AzCdnProfile, Remove-AzCdnProfile...}
Script 1.2.1 Az.CognitiveServices {Get-AzCognitiveServicesAccount, Get-AzCognitiveServicesAccountKey, Get-AzCognitiveServicesAccountSku, Get-AzCognitiveServicesAccountType...}
Script 2.7.0 Az.Compute {Remove-AzAvailabilitySet, Get-AzAvailabilitySet, New-AzAvailabilitySet, Update-AzAvailabilitySet...}
Script 1.0.1 Az.ContainerInstance {New-AzContainerGroup, Get-AzContainerGroup, Remove-AzContainerGroup, Get-AzContainerInstanceLog}
Script 1.1.0 Az.ContainerRegistry {New-AzContainerRegistry, Get-AzContainerRegistry, Update-AzContainerRegistry, Remove-AzContainerRegistry...}
Script 1.0.0 Az.CosmosDB {Get-AzCosmosDBSqlContainer, Get-AzCosmosDBSqlContainerThroughput, Get-AzCosmosDBSqlDatabase, Get-AzCosmosDBSqlDatabaseThroughput...}
Script 1.4.0 Az.DataFactory {Set-AzDataFactoryV2, Update-AzDataFactoryV2, Get-AzDataFactoryV2, Remove-AzDataFactoryV2...}
Script 1.0.1 Az.DataLakeAnalytics {Get-AzDataLakeAnalyticsDataSource, New-AzDataLakeAnalyticsCatalogCredential, Remove-AzDataLakeAnalyticsCatalogCredential, Set-AzDataLakeAnalyticsCatalogCredential...}
Script 1.2.3 Az.DataLakeStore {Get-AzDataLakeStoreTrustedIdProvider, Remove-AzDataLakeStoreTrustedIdProvider, Remove-AzDataLakeStoreFirewallRule, Set-AzDataLakeStoreTrustedIdProvider...}
Script 1.0.1 Az.DeploymentManager {Get-AzDeploymentManagerArtifactSource, New-AzDeploymentManagerArtifactSource, Set-AzDeploymentManagerArtifactSource, Remove-AzDeploymentManagerArtifactSource...}
Script 1.0.0 Az.DevTestLabs {Get-AzDtlAllowedVMSizesPolicy, Get-AzDtlAutoShutdownPolicy, Get-AzDtlAutoStartPolicy, Get-AzDtlVMsPerLabPolicy...}
Script 1.1.1 Az.Dns {Get-AzDnsRecordSet, New-AzDnsRecordConfig, Remove-AzDnsRecordSet, Set-AzDnsRecordSet...}
Script 1.2.2 Az.EventGrid {New-AzEventGridTopic, Get-AzEventGridTopic, Set-AzEventGridTopic, New-AzEventGridTopicKey...}
Script 1.4.0 Az.EventHub {New-AzEventHubNamespace, Get-AzEventHubNamespace, Set-AzEventHubNamespace, Remove-AzEventHubNamespace...}
Script 1.1.1 Az.FrontDoor {New-AzFrontDoor, Get-AzFrontDoor, Set-AzFrontDoor, Remove-AzFrontDoor...}
Script 2.0.2 Az.HDInsight {Get-AzHDInsightJob, New-AzHDInsightSqoopJobDefinition, Wait-AzHDInsightJob, New-AzHDInsightStreamingMapReduceJobDefinition...}
Script 1.0.0 Az.HealthcareApis {New-AzHealthcareApisService, Remove-AzHealthcareApisService, Set-AzHealthcareApisService, Get-AzHealthcareApisService}
Script 1.3.1 Az.IotHub {Add-AzIotHubKey, Get-AzIotHubEventHubConsumerGroup, Get-AzIotHubConnectionString, Get-AzIotHubJob...}
Script 1.3.1 Az.KeyVault {Add-AzKeyVaultCertificate, Update-AzKeyVaultCertificate, Stop-AzKeyVaultCertificateOperation, Get-AzKeyVaultCertificateOperation...}
Script 1.3.1 Az.LogicApp {Get-AzIntegrationAccountAgreement, Get-AzIntegrationAccountAssembly, Get-AzIntegrationAccountBatchConfiguration, Get-AzIntegrationAccountCallbackUrl...}
Script 1.1.1 Az.MachineLearning {Move-AzMlCommitmentAssociation, Get-AzMlCommitmentAssociation, Get-AzMlCommitmentPlanUsageHistory, Remove-AzMlCommitmentPlan...}
Script 1.0.1 Az.ManagedServices {Get-AzManagedServicesAssignment, New-AzManagedServicesAssignment, Remove-AzManagedServicesAssignment, Get-AzManagedServicesDefinition...}
Script 1.0.1 Az.MarketplaceOrdering {Get-AzMarketplaceTerms, Set-AzMarketplaceTerms}
Script 1.1.0 Az.Media {Sync-AzMediaServiceStorageKey, Set-AzMediaServiceKey, Get-AzMediaServiceKey, Get-AzMediaServiceNameAvailability...}
Script 1.4.0 Az.Monitor {Get-AzMetricDefinition, Get-AzMetric, Remove-AzLogProfile, Get-AzLogProfile...}
Script 1.15.0 Az.Network {Add-AzApplicationGatewayAuthenticationCertificate, Get-AzApplicationGatewayAuthenticationCertificate, New-AzApplicationGatewayAuthenticationCertificate, Remove-AzApplicationGatewayAuthenticationCertificate...}
Script 1.1.0 Az.NotificationHubs {Get-AzNotificationHub, Get-AzNotificationHubAuthorizationRule, Get-AzNotificationHubListKey, Get-AzNotificationHubPNSCredential...}
Script 1.3.3 Az.OperationalInsights {New-AzOperationalInsightsAzureActivityLogDataSource, New-AzOperationalInsightsCustomLogDataSource, Disable-AzOperationalInsightsLinuxCustomLogCollection, Disable-AzOperationalInsightsIISLogCollection...}
Script 1.1.3 Az.PolicyInsights {Get-AzPolicyEvent, Get-AzPolicyState, Get-AzPolicyStateSummary, Get-AzPolicyRemediation...}
Script 1.1.0 Az.PowerBIEmbedded {Remove-AzPowerBIWorkspaceCollection, Get-AzPowerBIWorkspaceCollection, Get-AzPowerBIWorkspaceCollectionAccessKey, Get-AzPowerBIWorkspace...}
Script 1.4.5 Az.RecoveryServices {Get-AzRecoveryServicesBackupProperty, Get-AzRecoveryServicesVault, Get-AzRecoveryServicesVaultSettingsFile, New-AzRecoveryServicesVault...}
Script 1.1.1 Az.RedisCache {Remove-AzRedisCachePatchSchedule, New-AzRedisCacheScheduleEntry, Get-AzRedisCachePatchSchedule, New-AzRedisCachePatchSchedule...}
Script 1.0.2 Az.Relay {New-AzRelayNamespace, Get-AzRelayNamespace, Set-AzRelayNamespace, Remove-AzRelayNamespace...}
Script 1.7.0 Az.Resources {Get-AzProviderOperation, Remove-AzRoleAssignment, Get-AzRoleAssignment, New-AzRoleAssignment...}
Script 1.4.0 Az.ServiceBus {New-AzServiceBusNamespace, Get-AzServiceBusNamespace, Set-AzServiceBusNamespace, Remove-AzServiceBusNamespace...}
Script 1.2.0 Az.ServiceFabric {Add-AzServiceFabricApplicationCertificate, Add-AzServiceFabricClientCertificate, Add-AzServiceFabricClusterCertificate, Add-AzServiceFabricNode...}
Script 1.1.0 Az.SignalR {New-AzSignalR, Get-AzSignalR, Get-AzSignalRKey, New-AzSignalRKey...}
Script 1.15.0 Az.Sql {Get-AzSqlDatabaseTransparentDataEncryption, Get-AzSqlDatabaseTransparentDataEncryptionActivity, Set-AzSqlDatabaseTransparentDataEncryption, Get-AzSqlDatabaseUpgradeHint...}
Script 1.8.0 Az.Storage {Get-AzStorageAccount, Get-AzStorageAccountKey, New-AzStorageAccount, New-AzStorageAccountKey...}
Script 1.2.1 Az.StorageSync {Invoke-AzStorageSyncCompatibilityCheck, New-AzStorageSyncService, Get-AzStorageSyncService, Remove-AzStorageSyncService...}
Script 1.0.0 Az.StreamAnalytics {Get-AzStreamAnalyticsFunction, Get-AzStreamAnalyticsDefaultFunctionDefinition, New-AzStreamAnalyticsFunction, Remove-AzStreamAnalyticsFunction...}
Script 1.0.2 Az.TrafficManager {Add-AzTrafficManagerCustomHeaderToEndpoint, Remove-AzTrafficManagerCustomHeaderFromEndpoint, Add-AzTrafficManagerCustomHeaderToProfile, Remove-AzTrafficManagerCustomHeaderFromProfile...}
Script 1.5.0 Az.Websites {Get-AzAppServicePlan, Set-AzAppServicePlan, New-AzAppServicePlan, Remove-AzAppServicePlan...}
Script 5.1.2 Azure {Get-AzureAutomationCertificate, Get-AzureAutomationConnection, New-AzureAutomationConnection, Remove-AzureAutomationConnection...}
Script 5.8.3 AzureRM.profile {Disable-AzureRmDataCollection, Disable-AzureRmContextAutosave, Enable-AzureRmDataCollection, Enable-AzureRmContextAutosave...}
Script 1.0.1 Microsoft.PowerShell.Operation.V... {Get-OperationValidation, Invoke-OperationValidation}
Binary 1.0.0.1 PackageManagement {Find-Package, Get-Package, Get-PackageProvider, Get-PackageSource...}
Script 3.4.0 Pester {Describe, Context, It, Should...}
Script 1.0.0.1 PowerShellGet {Install-Module, Find-Module, Save-Module, Update-Module...}
Script 2.0.0 PSReadline {Get-PSReadLineKeyHandler, Set-PSReadLineKeyHandler, Remove-PSReadLineKeyHandler, Get-PSReadLineOption...}
Directory: C:\WINDOWS\system32\WindowsPowerShell\v1.0\Modules
ModuleType Version Name ExportedCommands
Manifest 1.0.0.0 AppBackgroundTask {Disable-AppBackgroundTaskDiagnosticLog, Enable-AppBackgroundTaskDiagnosticLog, Set-AppBackgroundTaskResourcePolicy, Unregister-AppBackgroundTask...}
Manifest 2.0.0.0 AppLocker {Get-AppLockerFileInformation, Get-AppLockerPolicy, New-AppLockerPolicy, Set-AppLockerPolicy...}
Manifest 1.0.0.0 AppvClient {Add-AppvClientConnectionGroup, Add-AppvClientPackage, Add-AppvPublishingServer, Disable-Appv...}
Manifest 2.0.1.0 Appx {Add-AppxPackage, Get-AppxPackage, Get-AppxPackageManifest, Remove-AppxPackage...}
Script 1.0.0.0 AssignedAccess {Clear-AssignedAccess, Get-AssignedAccess, Set-AssignedAccess}
Manifest 1.0.0.0 BitLocker {Unlock-BitLocker, Suspend-BitLocker, Resume-BitLocker, Remove-BitLockerKeyProtector...}
Manifest 2.0.0.0 BitsTransfer {Add-BitsFile, Complete-BitsTransfer, Get-BitsTransfer, Remove-BitsTransfer...}
Manifest 1.0.0.0 BranchCache {Add-BCDataCacheExtension, Clear-BCCache, Disable-BC, Disable-BCDowngrading...}
Manifest 1.0.0.0 CimCmdlets {Get-CimAssociatedInstance, Get-CimClass, Get-CimInstance, Get-CimSession...}
Manifest 1.0 ConfigCI {Get-SystemDriver, New-CIPolicyRule, New-CIPolicy, Get-CIPolicy...}
Manifest 1.0 ConfigDefender {Get-MpPreference, Set-MpPreference, Add-MpPreference, Remove-MpPreference...}
Manifest 1.0 Defender {Get-MpPreference, Set-MpPreference, Add-MpPreference, Remove-MpPreference...}
Manifest 1.0.2.0 DeliveryOptimization {Delete-DeliveryOptimizationCache, Set-DeliveryOptimizationStatus, Get-DeliveryOptimizationLog, Get-DeliveryOptimizationLogAnalysis...}
Manifest 1.0.0.0 DirectAccessClientComponents {Disable-DAManualEntryPointSelection, Enable-DAManualEntryPointSelection, Get-DAClientExperienceConfiguration, Get-DAEntryPointTableItem...}
Script 3.0 Dism {Add-AppxProvisionedPackage, Add-WindowsDriver, Add-WindowsCapability, Add-WindowsImage...}
Manifest 1.0.0.0 DnsClient {Resolve-DnsName, Clear-DnsClientCache, Get-DnsClient, Get-DnsClientCache...}
Manifest 1.0.0.0 EventTracingManagement {Start-EtwTraceSession, New-EtwTraceSession, Get-EtwTraceSession, Update-EtwTraceSession...}
Manifest 1.0.0.0 HgsClient {Get-HgsAttestationBaselinePolicy, Get-HgsClientConfiguration, Test-HgsClientConfiguration, Set-HgsClientConfiguration...}
Manifest 1.0.0.0 HgsDiagnostics {New-HgsTraceTarget, Get-HgsTrace, Get-HgsTraceFileData, Test-HgsTraceTarget}
Binary 1.0.0.0 HostComputeService {Get-ComputeProcess, Stop-ComputeProcess}
Manifest 1.0.0.1 HostNetworkingService {Remove-HnsNamespace, Remove-HnsEndpoint, Get-HnsEndpoint, Remove-HnsPolicyList...}
Binary 2.0.0.0 Hyper-V {Add-VMAssignableDevice, Add-VMDvdDrive, Add-VMFibreChannelHba, Add-VMGpuPartitionAdapter...}
Binary 1.1 Hyper-V {Add-VMDvdDrive, Add-VMFibreChannelHba, Add-VMHardDiskDrive, Add-VMMigrationNetwork...}
Manifest 2.0.0.0 International {Get-WinDefaultInputMethodOverride, Set-WinDefaultInputMethodOverride, Get-WinHomeLocation, Set-WinHomeLocation...}
Manifest 1.0.0.0 iSCSI {Get-IscsiTargetPortal, New-IscsiTargetPortal, Remove-IscsiTargetPortal, Update-IscsiTargetPortal...}
Script 1.0.0.0 ISE {New-IseSnippet, Import-IseSnippet, Get-IseSnippet}
Manifest 1.0.0.0 Kds {Add-KdsRootKey, Get-KdsRootKey, Test-KdsRootKey, Set-KdsConfiguration...}
Manifest 1.0.1.0 Microsoft.PowerShell.Archive {Compress-Archive, Expand-Archive}
Manifest 3.0.0.0 Microsoft.PowerShell.Diagnostics {Get-WinEvent, Get-Counter, Import-Counter, Export-Counter...}
Manifest 3.0.0.0 Microsoft.PowerShell.Host {Start-Transcript, Stop-Transcript}
Manifest 1.0.0.0 Microsoft.PowerShell.LocalAccounts {Add-LocalGroupMember, Disable-LocalUser, Enable-LocalUser, Get-LocalGroup...}
Manifest 3.1.0.0 Microsoft.PowerShell.Management {Add-Content, Clear-Content, Clear-ItemProperty, Join-Path...}
Script 1.0 Microsoft.PowerShell.ODataUtils Export-ODataEndpointProxy
Manifest 3.0.0.0 Microsoft.PowerShell.Security {Get-Acl, Set-Acl, Get-PfxCertificate, Get-Credential...}
Manifest 3.1.0.0 Microsoft.PowerShell.Utility {Format-List, Format-Custom, Format-Table, Format-Wide...}
Manifest 3.0.0.0 Microsoft.WSMan.Management {Disable-WSManCredSSP, Enable-WSManCredSSP, Get-WSManCredSSP, Set-WSManQuickConfig...}
Manifest 1.0 MMAgent {Disable-MMAgent, Enable-MMAgent, Set-MMAgent, Get-MMAgent...}
Manifest 1.0.0.0 MsDtc {New-DtcDiagnosticTransaction, Complete-DtcDiagnosticTransaction, Join-DtcDiagnosticResourceManager, Receive-DtcDiagnosticTransaction...}
Manifest 2.0.0.0 NetAdapter {Disable-NetAdapter, Disable-NetAdapterBinding, Disable-NetAdapterChecksumOffload, Disable-NetAdapterEncapsulatedPacketTaskOffload...}
Manifest 1.0.0.0 NetConnection {Get-NetConnectionProfile, Set-NetConnectionProfile}
Manifest 1.0.0.0 NetDiagnostics Get-NetView
Manifest 1.0.0.0 NetEventPacketCapture {New-NetEventSession, Remove-NetEventSession, Get-NetEventSession, Set-NetEventSession...}
Manifest 2.0.0.0 NetLbfo {Add-NetLbfoTeamMember, Add-NetLbfoTeamNic, Get-NetLbfoTeam, Get-NetLbfoTeamMember...}
Manifest 1.0.0.0 NetNat {Get-NetNat, Get-NetNatExternalAddress, Get-NetNatStaticMapping, Get-NetNatSession...}
Manifest 2.0.0.0 NetQos {Get-NetQosPolicy, Set-NetQosPolicy, Remove-NetQosPolicy, New-NetQosPolicy}
Manifest 2.0.0.0 NetSecurity {Get-DAPolicyChange, New-NetIPsecAuthProposal, New-NetIPsecMainModeCryptoProposal, New-NetIPsecQuickModeCryptoProposal...}
Manifest 1.0.0.0 NetSwitchTeam {New-NetSwitchTeam, Remove-NetSwitchTeam, Get-NetSwitchTeam, Rename-NetSwitchTeam...}
Manifest 1.0.0.0 NetTCPIP {Get-NetIPAddress, Get-NetIPInterface, Get-NetIPv4Protocol, Get-NetIPv6Protocol...}
Manifest 1.0.0.0 NetworkConnectivityStatus {Get-DAConnectionStatus, Get-NCSIPolicyConfiguration, Reset-NCSIPolicyConfiguration, Set-NCSIPolicyConfiguration}
Manifest 1.0.0.0 NetworkSwitchManager {Disable-NetworkSwitchEthernetPort, Enable-NetworkSwitchEthernetPort, Get-NetworkSwitchEthernetPort, Remove-NetworkSwitchEthernetPortIPAddress...}
Manifest 1.0.0.0 NetworkTransition {Add-NetIPHttpsCertBinding, Disable-NetDnsTransitionConfiguration, Disable-NetIPHttpsProfile, Disable-NetNatTransitionConfiguration...}
Manifest 1.0.0.0 PcsvDevice {Get-PcsvDevice, Start-PcsvDevice, Stop-PcsvDevice, Restart-PcsvDevice...}
Binary 1.0.0.0 PersistentMemory {Get-PmemDisk, Get-PmemPhysicalDevice, Get-PmemUnusedRegion, New-PmemDisk...}
Manifest 1.0.0.0 PKI {Add-CertificateEnrollmentPolicyServer, Export-Certificate, Export-PfxCertificate, Get-CertificateAutoEnrollmentPolicy...}
Manifest 1.0.0.0 PnpDevice {Get-PnpDevice, Get-PnpDeviceProperty, Enable-PnpDevice, Disable-PnpDevice}
Manifest 1.1 PrintManagement {Add-Printer, Add-PrinterDriver, Add-PrinterPort, Get-PrintConfiguration...}
Binary 1.0.12 ProcessMitigations {Get-ProcessMitigation, Set-ProcessMitigation, ConvertTo-ProcessMitigationPolicy}
Script 3.0 Provisioning {Install-ProvisioningPackage, Export-ProvisioningPackage, Install-TrustedProvisioningCertificate, Export-Trace...}
Manifest 1.1 PSDesiredStateConfiguration {Set-DscLocalConfigurationManager, Start-DscConfiguration, Test-DscConfiguration, Publish-DscConfiguration...}
Script 1.0.0.0 PSDiagnostics {Disable-PSTrace, Disable-PSWSManCombinedTrace, Disable-WSManTrace, Enable-PSTrace...}
Binary 1.1.0.0 PSScheduledJob {New-JobTrigger, Add-JobTrigger, Remove-JobTrigger, Get-JobTrigger...}
Manifest 2.0.0.0 PSWorkflow {New-PSWorkflowExecutionOption, New-PSWorkflowSession, nwsn}
Manifest 1.0.0.0 PSWorkflowUtility Invoke-AsWorkflow
Manifest 1.0.0.0 ScheduledTasks {Get-ScheduledTask, Set-ScheduledTask, Register-ScheduledTask, Unregister-ScheduledTask...}
Manifest 2.0.0.0 SecureBoot {Confirm-SecureBootUEFI, Set-SecureBootUEFI, Get-SecureBootUEFI, Format-SecureBootUEFI...}
Manifest 3.1.0.0 ServiceFabric {Get-ServiceFabricServiceName, Get-ServiceFabricApplicationName, Approve-ServiceFabricRepairTask, Remove-ServiceFabricTestState...}
Manifest 2.0.0.0 SmbShare {Get-SmbShare, Remove-SmbShare, Set-SmbShare, Block-SmbShareAccess...}
Manifest 2.0.0.0 SmbWitness {Get-SmbWitnessClient, Move-SmbWitnessClient, gsmbw, msmbw...}
Manifest 1.0.0.1 StartLayout {Export-StartLayout, Import-StartLayout, Export-StartLayoutEdgeAssets, Get-StartApps}
Manifest 2.0.0.0 Storage {Add-InitiatorIdToMaskingSet, Add-PartitionAccessPath, Add-PhysicalDisk, Add-StorageFaultDomain...}
Manifest 1.0.0.0 StorageBusCache {Clear-StorageBusDisk, Disable-StorageBusCache, Disable-StorageBusDisk, Enable-StorageBusCache...}
Manifest 2.0.0.0 TLS {New-TlsSessionTicketKey, Enable-TlsSessionTicketKey, Disable-TlsSessionTicketKey, Export-TlsSessionTicketKey...}
Manifest 1.0.0.0 TroubleshootingPack {Get-TroubleshootingPack, Invoke-TroubleshootingPack}
Manifest 2.0.0.0 TrustedPlatformModule {Get-Tpm, Initialize-Tpm, Clear-Tpm, Unblock-Tpm...}
Binary 2.1.639.0 UEV {Clear-UevConfiguration, Clear-UevAppxPackage, Restore-UevBackup, Set-UevTemplateProfile...}
Manifest 2.0.0.0 VpnClient {Add-VpnConnection, Set-VpnConnection, Remove-VpnConnection, Get-VpnConnection...}
Manifest 1.0.0.0 Wdac {Get-OdbcDriver, Set-OdbcDriver, Get-OdbcDsn, Add-OdbcDsn...}
Manifest 2.0.0.0 Whea {Get-WheaMemoryPolicy, Set-WheaMemoryPolicy}
Manifest 1.0.0.0 WindowsDeveloperLicense {Get-WindowsDeveloperLicense, Unregister-WindowsDeveloperLicense, Show-WindowsDeveloperLicenseRegistration}
Script 1.0 WindowsErrorReporting {Enable-WindowsErrorReporting, Disable-WindowsErrorReporting, Get-WindowsErrorReporting}
Manifest 1.0.0.0 WindowsSearch {Get-WindowsSearchSetting, Set-WindowsSearchSetting}
Manifest 1.0.0.0 WindowsUpdate Get-WindowsUpdateLog
Manifest 1.0.0.2 WindowsUpdateProvider {Get-WUAVersion, Get-WULastInstallationDate, Get-WULastScanSuccessDate, Get-WUIsPendingReboot...}
Directory: C:\Program Files (x86)\Microsoft Azure Information Protection\Powershell
ModuleType Version Name ExportedCommands
Binary 2.6.111.0 AzureInformationProtection {Clear-AIPAuthentication, Get-AIPFileStatus, New-AIPCustomPermissions, Export-AIPLogs...}

Answer 1

According to the error, the MetricNameSpace Microsoft.Sql/servers/databases does not contain metric SqlDbDtuUsageMetric. Regarding the supported metric, please use the following command to get
Connect-AzAccount
Get-AzMetricDefinition -MetricNamespace "Microsoft.Sql/servers/databases" -ResourceId "<the resource id of your spl database>"
For more details, please refer to here and here