diff --git a/profiles/crawl-log.json b/profiles/crawl-log.json
index 005f73bb509c..6a3ff4a4c16e 100644
--- a/profiles/crawl-log.json
+++ b/profiles/crawl-log.json
@@ -16926,6 +16926,30 @@
       "providerNamespace": "microsoft.customerinsights",
       "name": "hubs/images"
     },
+    {
+      "path": "/providers/Microsoft.CustomProviders/operations",
+      "apiVersion": "2018-09-01-preview",
+      "providerNamespace": "microsoft.customproviders",
+      "name": "operations"
+    },
+    {
+      "path": "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.CustomProviders/resourceProviders/{resourceProviderName}",
+      "apiVersion": "2018-09-01-preview",
+      "providerNamespace": "microsoft.customproviders",
+      "name": "resourceProviders"
+    },
+    {
+      "path": "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.CustomProviders/resourceProviders",
+      "apiVersion": "2018-09-01-preview",
+      "providerNamespace": "microsoft.customproviders",
+      "name": "resourceProviders"
+    },
+    {
+      "path": "/subscriptions/{subscriptionId}/providers/Microsoft.CustomProviders/resourceProviders",
+      "apiVersion": "2018-09-01-preview",
+      "providerNamespace": "microsoft.customproviders",
+      "name": "resourceProviders"
+    },
     {
       "path": "/providers/Microsoft.DataBox/operations",
       "apiVersion": "2018-01-01",
diff --git a/profiles/definitions/hybrid-2018-03-01.md b/profiles/definitions/hybrid-2018-03-01.md
deleted file mode 100644
index 59afbc7bfc58..000000000000
--- a/profiles/definitions/hybrid-2018-03-01.md
+++ /dev/null
@@ -1,134 +0,0 @@
-# Hybrid Profile Definition - Azure Stack 1807 and Azure Cloud
-
-> see https://aka.ms/autorest
-
-Profile definition targeted for hybrid applications that could run on azure stack 1808 version and azure cloud.
-
-``` yaml
-profiles:
-  hybrid-2018-03-01:
-    resources:
-      microsoft.authorization:
-        '2016-09-01':
-          - locks
-        '2015-07-01':
-          - operations
-          - permissions
-          - roleAssignments
-          - roleDefinitions
-        '2016-12-01':
-          - policyAssignments
-          - policyDefinitions
-      microsoft.compute:
-        '2017-03-30':
-          - availabilitySets
-          - locations
-          - disks
-          - diskoperations
-          - locations/diskoperations
-          - locations/publishers
-          - locations/operations
-          - locations/usages
-          - locations/vmSizes
-          - operations
-          - snapshots
-          - virtualMachines
-          - virtualMachines/extensions
-          - virtualMachineScaleSets
-          - virtualMachineScaleSets/extensions
-          - virtualMachineScaleSets/networkInterfaces
-          - virtualMachineScaleSets/virtualMachines
-          - virtualMachineScaleSets/virtualMachines/networkInterfaces
-      microsoft.keyvault:
-        '2016-10-01':
-          - operations
-          - vaults
-          - vaults/accessPolicies
-          - vaults/secrets
-      microsoft.network:
-        '2017-10-01':
-          - connections
-          - loadBalancers
-          - localNetworkGateways
-          - locations
-          - locations/operationResults
-          - locations/operations
-          - locations/usages
-          - networkInterfaces
-          - networkSecurityGroups
-          - operations
-          - publicIpAddresses
-          - routeTables
-          - virtualNetworkGateways
-          - virtualNetworks
-        '2016-04-01':
-          - dnsZones
-      microsoft.resources:
-        '2016-06-01':
-          - subscriptions
-          - subscriptions/locations
-          - tenants
-        '2018-02-01':
-          - deployments
-          - deployments/operations
-          - links
-          - locations
-          - operations
-          - providers
-          - resourceGroups
-          - resources
-          - subscriptions/operationresults
-          - subscriptions/providers
-          - subscriptions/resourceGroups
-          - subscriptions/resourceGroups/resources
-          - subscriptions/resources
-          - subscriptions/tagNames
-          - subscriptions/tagNames/tagValues
-      microsoft.storage:
-        '2016-01-01':
-          - checkNameAvailability
-          - locations
-          - locations/quotas
-          - operations
-          - storageAccounts
-          - usages
-      microsoft.web:
-        '2016-03-01':
-          - certificates
-          - deploymentLocations
-          - georegions
-          - operations
-          - recommendations
-          - runtimes
-          - validate
-        '2016-08-01':
-          - availableStacks
-          - checknameavailability
-          - ishostnameavailable
-          - isusernameavailable
-          - metadata
-          - publishingUsers
-          - sourceControls
-          - sites
-          - sites/domainOwnershipIdentifiers
-          - sites/extensions
-          - sites/hostNameBindings
-          - sites/instances
-          - sites/instances/extensions
-          - sites/metrics
-          - sites/metricDefinitions
-          - sites/recommendations
-          - sites/slots
-          - sites/slots/extensions
-          - sites/slots/hostNameBindings
-          - sites/slots/instances
-          - sites/slots/instances/extensions
-          - sites/slots/metrics
-          - sites/slots/metricDefinitions
-        '2016-09-01':
-          - serverFarms
-          - serverFarms/metrics
-          - serverFarms/metricDefinitions
-          - serverFarms/usages
-    operations: {}
-```
\ No newline at end of file
diff --git a/profiles/definitions/latest-2019-04-30.md b/profiles/definitions/latest-2019-04-30.md
index d232011ad030..ff90b94ef11c 100644
--- a/profiles/definitions/latest-2019-04-30.md
+++ b/profiles/definitions/latest-2019-04-30.md
@@ -1258,6 +1258,10 @@ profiles:
           - checkNameAvailability
           - operations
           - skus
+      microsoft.customproviders:
+        2018-09-01-preview:
+          - operations
+          - resourceProviders
       microsoft.deploymentmanager:
         2018-09-01-preview:
           - artifactSources
@@ -1878,7 +1882,6 @@ profiles:
           - operations
           - servers/configurations
           - servers/databases
-          - servers/firewallRules
           - servers/logFiles
           - servers/replicas
           - servers/restart
@@ -1886,6 +1889,7 @@ profiles:
           - servers/virtualNetworkRules
         2018-06-01-preview:
           - servers
+          - servers/firewallRules
       microsoft.managedservices:
         2018-06-01-preview:
           - operations
@@ -2027,20 +2031,6 @@ profiles:
           - clusters/applicationTypes/versions
           - clusters/applications
           - clusters/applications/services
-      microsoft.domainregistration:
-        '2018-02-01':
-          - checkDomainAvailability
-          - domains
-          - domains/domainOwnershipIdentifiers
-          - domains/renew
-          - generateSsoRequest
-          - listDomainRecommendations
-          - operations
-          - topLevelDomains
-          - topLevelDomains/listAgreements
-        '2015-08-01':
-          - domains/operationresults
-          - validateDomainRegistrationInformation
       microsoft.certificateregistration:
         '2018-02-01':
           - certificateOrders
@@ -2055,6 +2045,20 @@ profiles:
           - certificateOrders/verifyDomainOwnership
           - operations
           - validateCertificateRegistrationInformation
+      microsoft.domainregistration:
+        '2018-02-01':
+          - checkDomainAvailability
+          - domains
+          - domains/domainOwnershipIdentifiers
+          - domains/renew
+          - generateSsoRequest
+          - listDomainRecommendations
+          - operations
+          - topLevelDomains
+          - topLevelDomains/listAgreements
+        '2015-08-01':
+          - domains/operationresults
+          - validateDomainRegistrationInformation
       microsoft.servicebus:
         2018-01-01-preview:
           - namespaces
@@ -2128,36 +2132,36 @@ profiles:
           - sku/regions
         '2014-09-01':
           - CheckNamespaceAvailability
-      microsoft.dbforpostgresql:
-        2017-12-01-preview:
-          - operations
-          - servers
-          - servers/Replicas
-          - servers/configurations
-          - servers/databases
+      microsoft.dbformysql:
         '2017-12-01':
           - checkNameAvailability
           - locations/performanceTiers
+          - operations
+          - servers/configurations
+          - servers/databases
           - servers/firewallRules
           - servers/logFiles
+          - servers/replicas
           - servers/restart
           - servers/securityAlertPolicies
           - servers/virtualNetworkRules
-      microsoft.dbformysql:
         2017-12-01-preview:
-          - checkNameAvailability
-          - locations/performanceTiers
+          - servers
+      microsoft.dbforpostgresql:
+        '2017-12-01':
           - operations
           - servers
-          - servers/configurations
-          - servers/databases
-          - servers/firewallRules
           - servers/logFiles
-        '2017-12-01':
-          - servers/replicas
           - servers/restart
           - servers/securityAlertPolicies
           - servers/virtualNetworkRules
+        2017-12-01-preview:
+          - checkNameAvailability
+          - locations/performanceTiers
+          - servers/Replicas
+          - servers/configurations
+          - servers/databases
+          - servers/firewallRules
       microsoft.hanaonazure:
         2017-11-03-preview:
           - hanaInstances
@@ -2186,6 +2190,11 @@ profiles:
           - profiles/generateSsoUri
           - profiles/getSupportedOptimizationTypes
           - validateProbe
+      microsoft.iotspaces:
+        2017-10-01-preview:
+          - Graph
+          - checkNameAvailability
+          - operations
       microsoft.powerbidedicated:
         '2017-10-01':
           - capacities
@@ -2195,11 +2204,6 @@ profiles:
           - locations/checkNameAvailability
           - operations
           - skus
-      microsoft.iotspaces:
-        2017-10-01-preview:
-          - Graph
-          - checkNameAvailability
-          - operations
       microsoft.operationalinsights:
         '2017-10-01':
           - workspaces/query
@@ -2246,16 +2250,17 @@ profiles:
           - workspaces/storageInsightConfigs
       microsoft.analysisservices:
         '2017-08-01':
+          - servers
+          - servers/resume
+          - servers/suspend
+        2017-08-01-beta:
           - locations/checkNameAvailability
           - locations/operationresults
           - locations/operationstatuses
           - operations
-          - servers
           - servers/dissociateGateway
           - servers/listGatewayStatus
-          - servers/resume
           - servers/skus
-          - servers/suspend
           - skus
       microsoft.machinelearningcompute:
         2017-08-01-preview:
@@ -2273,6 +2278,14 @@ profiles:
           - childAvailabilityStatuses
           - childResources
           - operations
+      microsoft.azurestack:
+        '2017-06-01':
+          - operations
+          - registrations
+          - registrations/customerSubscriptions
+          - registrations/getactivationkey
+          - registrations/products
+          - registrations/products/listDetails
       microsoft.storsimple:
         '2017-06-01':
           - managers
@@ -2362,14 +2375,6 @@ profiles:
         '2017-06-01':
           - domainServices
           - operations
-      microsoft.azurestack:
-        '2017-06-01':
-          - operations
-          - registrations
-          - registrations/customerSubscriptions
-          - registrations/getactivationkey
-          - registrations/products
-          - registrations/products/listDetails
       microsoft.machinelearningexperimentation:
         2017-05-01-preview:
           - accounts
diff --git a/profiles/definitions/profile-2017-03-09.md b/profiles/definitions/profile-2017-03-09.md
deleted file mode 100644
index 8d0776d3b8a5..000000000000
--- a/profiles/definitions/profile-2017-03-09.md
+++ /dev/null
@@ -1,95 +0,0 @@
-# Hybrid Profile Definition - Azure Stack General Availability and Azure Cloud
-
-> see https://aka.ms/autorest
-
-Profile definition targeted for hybrid applications that could run on azure stack general availability version and azure cloud.
-
-``` yaml
-profiles:
-  profile-2017-03-09:
-    resources:
-      microsoft.authorization:
-        '2015-01-01':
-          - locks
-        '2015-07-01':
-          - operations
-          - permissions
-          - roleAssignments
-          - roleDefinitions
-        2015-10-01-preview:
-          - policyAssignments
-          - policyDefinitions
-        2015-07-01-preview:
-          - providerOperations
-      microsoft.compute:
-        '2016-03-30':
-          - availabilitySets
-          - locations
-          - locations/publishers
-          - locations/operations
-          - locations/usages
-          - locations/vmSizes
-          - operations
-          - virtualMachines
-          - virtualMachines/extensions
-          - virtualMachineScaleSets
-          - virtualMachineScaleSets/extensions
-          - virtualMachineScaleSets/networkInterfaces
-          - virtualMachineScaleSets/virtualMachines
-          - virtualMachineScaleSets/virtualMachines/networkInterfaces
-      microsoft.keyvault:
-        '2016-10-01':
-          - operations
-          - vaults
-          - vaults/accessPolicies
-          - vaults/secrets
-      microsoft.network:
-        '2015-06-15':
-          - connections
-          - loadBalancers
-          - localNetworkGateways
-          - locations
-          - locations/operationResults
-          - locations/operations
-          - locations/usages
-          - networkInterfaces
-          - networkSecurityGroups
-          - operations
-          - publicIpAddresses
-          - routeTables
-          - virtualNetworkGateways
-          - virtualNetworks
-        '2016-04-01':
-          - dnsZones
-      microsoft.resources:
-        '2016-02-01':
-          - deployments
-          - deployments/operations
-          - locations
-          - operations
-          - providers
-          - resourceGroups
-          - resources
-          - tenants
-        '2016-09-01':
-          - links
-        '2016-06-01':
-          - subscriptions
-          - subscriptions/locations
-          - subscriptions/operationresults
-          - subscriptions/providers
-          - subscriptions/resourceGroups
-          - subscriptions/resourceGroups/resources
-          - subscriptions/resources
-          - subscriptions/tagNames
-          - subscriptions/tagNames/tagValues
-      microsoft.storage:
-        '2016-01-01':
-          - checkNameAvailability
-          - locations
-          - locations/quotas
-          - operations
-          - storageAccounts
-          - usages
-    operations: {}
-```
\ No newline at end of file
diff --git a/profiles/definitions/stable-2019-01.md b/profiles/definitions/stable-2019-01.md
deleted file mode 100644
index c4af54bbf852..000000000000
--- a/profiles/definitions/stable-2019-01.md
+++ /dev/null
@@ -1,161 +0,0 @@
-# Stable-2019-01  
-
-> see https://aka.ms/autorest
-
-This profile definition was created based on 2019-03-01-hybrid, 2018-03-01-hybrid and 2017-03-09-profile.
-
-``` yaml
-profiles:
-  stable-2019-01:
-    resources:
-      microsoft.resources:
-        '2018-05-01':
-          - deployments
-          - deployments/operations
-          - links
-          - locations
-          - operations    
-          - providers
-          - resourceGroups
-          - resources
-          - subscriptions
-          - subscriptions/locations
-          - subscriptions/operationresults
-          - subscriptions/providers
-          - subscriptions/resourceGroups
-          - subscriptions/resourceGroups/resources
-          - subscriptions/resources
-          - subscriptions/tagNames
-          - subscriptions/tagNames/tagValues
-          - tenants
-      microsoft.web:
-        '2018-02-01':
-          - certificates
-          - checknameavailability
-          - operations
-          - serverFarms
-          - sites
-          - sites/domainOwnershipIdentifiers
-          - sites/extensions
-          - sites/hostNameBindings
-          - sites/instances
-          - sites/instances/extensions
-          - sites/slots
-          - sites/slots/hostNameBindings
-          - sites/slots/instances
-          - sites/slots/instances/extensions
-        '2016-09-01':
-          - serverFarms/metricDefinitions
-          - serverFarms/metrics
-          - serverFarms/usages
-        '2016-08-01':
-          - availableStacks
-          - ishostnameavailable
-          - isusernameavailable
-          - metadata
-          - publishingUsers
-          - sites/metricDefinitions
-          - sites/metrics
-          - sites/recommendations
-          - sites/slots/extensions
-          - sites/slots/metricDefinitions
-          - sites/slots/metrics
-          - sourceControls
-        '2016-03-01':
-          - deploymentLocations
-          - georegions
-          - listSitesAssignedToHostName
-          - recommendations
-          - runtimes
-          - validate
-      microsoft.eventhub:
-        2018-01-01-preview:
-          - checkNameAvailability
-          - namespaces
-          - operations
-          - sku
-        '2015-08-01':
-          - checkNamespaceAvailability
-      microsoft.insights:
-        '2018-01-01':
-          - metricDefinitions
-          - metrics
-        2017-05-01-preview:
-          - diagnosticSettingCategories
-          - diagnosticSettings
-        '2015-04-01':
-          - eventCategories
-          - eventTypes
-          - operations
-      microsoft.compute:
-        '2017-12-01':
-          - availabilitySets
-          - images
-          - locations
-          - locations/operations
-          - locations/publishers
-          - locations/usages
-          - locations/vmSizes
-          - operations
-          - virtualMachineScaleSets
-          - virtualMachineScaleSets/extensions
-          - virtualMachineScaleSets/virtualMachines
-          - virtualMachineScaleSets/virtualMachines/networkInterfaces
-          - virtualMachines
-          - virtualMachines/extensions
-          - virtualmachineScaleSets/networkInterfaces
-        '2017-03-30':
-          - diskoperations
-          - disks
-          - locations/diskoperations
-          - snapshots
-      microsoft.network:
-        '2017-10-01':
-          - connections
-          - loadBalancers
-          - localNetworkGateways
-          - locations
-          - locations/operationResults
-          - locations/operations
-          - locations/usages
-          - networkInterfaces
-          - networkSecurityGroups
-          - operations
-          - publicIpAddresses
-          - routeTables
-          - virtualNetworkGateways
-          - virtualNetworks
-        '2016-04-01':
-          - dnsZones
-      microsoft.storage:
-        '2017-10-01':
-          - checkNameAvailability
-          - locations
-          - locations/quotas
-          - operations
-          - storageAccounts
-          - storageAccounts/blobServices
-          - storageAccounts/queueServices
-          - storageAccounts/tableServices
-          - usages
-      microsoft.authorization:
-        '2016-12-01':
-          - policyAssignments
-          - policyDefinitions
-        '2016-09-01':
-          - locks
-        2015-07-01-preview:
-          - providerOperations
-        '2015-07-01':
-          - operations
-          - permissions
-          - roleAssignments
-          - roleDefinitions
-      microsoft.keyvault:
-        '2016-10-01':
-          - operations
-          - vaults
-          - vaults/accessPolicies
-          - vaults/secrets
-    operations: {}
-```
\ No newline at end of file
diff --git a/profiles/readme.md b/profiles/readme.md
index 01dc1876149e..223b068ab868 100644
--- a/profiles/readme.md
+++ b/profiles/readme.md
@@ -6,12 +6,9 @@
 
 ``` yaml
 require:
-  - $(this-folder)/definitions/hybrid-2018-03-01.md
   - $(this-folder)/definitions/hybrid-2019-03-01.md
   - $(this-folder)/definitions/latest-2019-04-01.md
   - $(this-folder)/definitions/latest-2019-04-24.md
   - $(this-folder)/definitions/latest-2019-04-29.md
   - $(this-folder)/definitions/latest-2019-04-30.md
-  - $(this-folder)/definitions/profile-2017-03-09.md
-  - $(this-folder)/definitions/stable-2019-01.md
 ```
diff --git a/specification/customproviders/resource-manager/readme.enable-multi-api.md b/specification/customproviders/resource-manager/readme.enable-multi-api.md
new file mode 100644
index 000000000000..f75445ce4af0
--- /dev/null
+++ b/specification/customproviders/resource-manager/readme.enable-multi-api.md
@@ -0,0 +1,9 @@
+# Multi-API support for AutoRest v3 generators
+
+> see https://aka.ms/autorest
+
+``` yaml
+input-file:
+  - $(this-folder)/Microsoft.CustomProviders/preview/2018-09-01-preview/customproviders.json
+require: $(this-folder)/../../../profiles/readme.md
+```