Are there any prerequisites needed for monitoring OpenStack in Applications Manager?

1. If user credential used while adding OpenStack monitor is an administrative user,, then by default 'policy defaults' will allow access to all the APIs.
   
2. If the user is not an administrator, then access to the above mentioned APIs should be given in the respective service's policy file for the user.

How can I give access to APIs via policy file?

1. Each OpenStack service defines the access policies for its resources in an associated policy file. To know more about policies, refer here.
   
2. There are two types of policy configuration files: policy.json & policy.yaml.
   
3. Each service has its own policy file and API permission for a user should be specified in the file (Sample can be seen below).
   
4. However, in the latest release after Queens, there will be no more configurations by default.
   
1. You have to manually create the file.
   
2. By default, administrative users will have all the permissions.
   

How can I configure policy file for each service?

1. To give access to Authentication API, refer the policy configuration of Keystone service.
   
2. To give access to Cinder API, refer the policy configuration of Cinder service.
   
3. To give access to Glance API, refer the policy configuration of Glance service.
   
4. To give access to Hypervisor (Nova) API, refer the policy configuration of Nova service.
   
5. To give access to Neutron API, refer the policy configuration of Neutron service.
   
6. To give access to Nova API, refer the policy configuration of Nova service.

• Base Authentication URL
• Tenant Name
• Username and Password
• Project-scoped Token (If applicable)