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Starting with Ocata, the default backend is Gnocchi, and MongoDB is deprecated.

Yes, the backend has to be installed. MongoDB installation under Newton: https://docs.openstack.org/project-install-guide/telemetry/newton/database/environment-nosql-database-ubuntu.html. Gnocchi installation under Pike: https://docs.openstack.org/ceilometer/latest/install/install-base-ubuntu.html#install-gnocchi.

In both cases, the connection between Ceilometer and the backend is made with configuration options. No script is needed. MongoDB: https://docs.openstack.org/project-install-guide/telemetry/newton/install-base-ubuntu.html#install-and-configure-components. Gnocchi is configured in the pipeline.yaml file, see https://docs.openstack.org/ceilometer/latest/install/install-base-ubuntu.html#install-and-configure-components.

Starting with Ocata, the default backend is Gnocchi, and MongoDB is deprecated.

Yes, the backend has to be installed. MongoDB installation under Newton: https://docs.openstack.org/project-install-guide/telemetry/newton/database/environment-nosql-database-ubuntu.html. Gnocchi installation under Pike: https://docs.openstack.org/ceilometer/latest/install/install-base-ubuntu.html#install-gnocchi.

In both cases, the connection between Ceilometer and the backend is made with configuration options. No script is needed. MongoDB: https://docs.openstack.org/project-install-guide/telemetry/newton/install-base-ubuntu.html#install-and-configure-components. Gnocchi is configured in the pipeline.yaml file, see https://docs.openstack.org/ceilometer/latest/install/install-base-ubuntu.html#install-and-configure-components.

Starting with Ocata, the default backend is Gnocchi, and MongoDB is deprecated.

Yes, the backend has to be installed. MongoDB installation under Newton: : (Newton): https://docs.openstack.org/project-install-guide/telemetry/newton/database/environment-nosql-database-ubuntu.html. Gnocchi installation under Pike: (Pike): https://docs.openstack.org/ceilometer/latest/install/install-base-ubuntu.html#install-gnocchi.

In both cases, the connection between Ceilometer and the backend is made with configuration options. No script is needed. MongoDB: https://docs.openstack.org/project-install-guide/telemetry/newton/install-base-ubuntu.html#install-and-configure-components. Gnocchi : is configured in the pipeline.yaml file, see https://docs.openstack.org/ceilometer/latest/install/install-base-ubuntu.html#install-and-configure-components.

Starting with Ocata, the default backend is Gnocchi, and MongoDB is deprecated.

Yes, the backend has to be installed. MongoDB: (Newton): https://docs.openstack.org/project-install-guide/telemetry/newton/database/environment-nosql-database-ubuntu.html. Gnocchi (Pike): : https://docs.openstack.org/ceilometer/latest/install/install-base-ubuntu.html#install-gnocchi.

In both cases, the connection between Ceilometer and the backend is made with configuration options. No script is needed. MongoDB: https://docs.openstack.org/project-install-guide/telemetry/newton/install-base-ubuntu.html#install-and-configure-components. Gnocchi: Since Ocata (?), the backend is configured in the pipeline.yaml file, see https://docs.openstack.org/ceilometer/latest/install/install-base-ubuntu.html#install-and-configure-components.