Moves the query_retry method into the baseclass and makes the query
retry and timeout options part of the watcher_datasources config group.
This makes the query_retry behavior uniform across all datasources.
A new baseclass method named query_retry_reset is added so datasources
can define operations to perform when recovering from a query error.
Test cases are added to verify the behavior of query_retry.
The query_max_retries and query_timeout config parameters are
deprecated in the gnocchi_client group and will be removed in a future
release.
Change-Id: I33e9dc2d1f5ba8f83fcf1488ff583ca5be5529cc
Changes to the baseclass for datasources so strategies can be made
compatible with every datasource. Baseclass methods clearly describe
expected values and types for both parameters and for method returns.
query_retry has been added as base method since every current
datasource implements it.
Ceilometer is updated to work with the new baseclass. Several methods
which are not part of the baseclass and are not used by any strategies
are removed. The signature of these methods would have to be changed
to fit with the new base class while it would limit strategies to
only work with Ceilometer.
Gnocchi is updated to work with the new baseclass.
Gnocchi and Ceilometer will perform a transformation for the
host_airflow metric as it retrieves 1/10 th of the actual CFM
Monasca is updated to work with the new baseclass.
FakeMetrics for Gnocchi, Monasca and Ceilometer are updated to work
with the new method signatures of the baseclass.
FakeClusterAndMetrics for Ceilometer and Gnocchi are updated to work
with the new method signatures of the baseclass.
The strategies workload_balance, vm_workload_consolidation,
workload_stabilization, basic_consolidation, noisy_neighbour,
outlet_temp_control and uniform_airflow are updated to work with the
new datasource baseclass.
This patch will break compatibility with plugin strategies and
datasources due to the changes in signatures.
Depends-on: I7aa52a9b82f4aa849f2378d4d1c03453e45c0c78
Change-Id: Ie30ca3dbf01062cbb20d3be5d514ec6b5155cd7c
Implements: blueprint formal-datasource-interface
Allows to define a global preference for metric datasources with the
ability for strategy specific overrides. In addition, strategies which
do not require datasources have the config options removed this is
done to prevent confusion.
Some documentation that details the inner workings of selecting
datasources is updated.
Imports for some files in watcher/common have been changed to resolve
circular dependencies and now match the overall method to import
configuration.
Addtional datasources will be retrieved by the manager if the
datasource throws an error.
Implements: blueprint global-datasource-preference
Change-Id: I6fc455b288e338c20d2c4cfec5a0c95350bebc36
