v2.1.0 - December 05, 2016

• Add new POST /v1/actionalias/match API endpoint which allows users to perform ChatOps action
  alias matching server-side. This makes it easier to build and maintain StackStorm ChatOps
  clients / adapters for various protocols and mediums. Clients can now be very thin wrappers
  around this new API endpoint.

  Also add two new corresponding CLI commands - st2 alias-execution match and
  st2 alias-execution execute. (new feature) #2895

  Contributed by Anthony Shaw

• Only allow valid word characters (a-z, 0-9 and _) to be used for action parameter
  names. Previously, due to bug in the code, any character was allowed.

  If you have an existing action definition which uses parameter with an invalid character, the
  parameter name needs to be adjusted otherwise action registration will fail. (bug fix,
  improvement)

• Adding ability to pass complex array types via CLI by first trying to
  seralize the array as JSON and then falling back to comma separated array.

• Add new core.pause action. This action behaves like sleep and can be used inside the action
  chain or Mistral workflows where waiting / sleeping is desired before proceeding with a next
  task. (new feature) #2933

  Contribution by Paul Mulvihill.

• Improve API exception handling and make sure 400 status code is returned instead of 500 on
  mongoengine field validation error. (improvement)

• Allow user to supply multiple resource ids using ?id query parameter when filtering
  "get all" API endpoint result set (e.g. ?id=1,2,3,4). This allows for a better client and
  servers performance when user is polling and interested in multiple resources such as polling on
  multiple action executions. (improvement)

• Actually validate pack metadata file when registering packs. (bug fix, improvement)

• Improve pack validation - now when the packs are registered we require that
  "version" attribute in the pack metadata file matches valid semver format and we also require
  that "email" attribute (if specified) contains a valid email address. (improvement)

• For consistency with new pack name validation changes, sample hello-st2 pack has been renamed
  to hello_st2.

• Add new stackstorm_version and system fields to the pack.yaml metadata file. Value of the
  first field can contain a specific for StackStorm version with which the pack is designed to work
  with (e.g. >=1.6.0,<2.2.0 or >2.0.0). This field is checked when installing / registering
  a pack and installation is aborted if pack doesn't support StackStorm version which is currently
  running. Second field can contain an object with optional system / OS level dependencies.
  (new feature)

• Require pack metadata version attribute to contain a valid semver version identifier (e.g
  0.1.0, 2.0.0, etc.). If version identifier is invalid, pack registration will fail.
  (improvement)

• When a policy cancels a request due to concurrency, it leaves end_timestamp set to None which
  the notifier expects to be a date. This causes an exception in "isotime.format()". A patch was
  released that catches this exception, and populates payload['end_timestamp'] with the equivalent
  of "datetime.now()" when the exception occurs.

• Adding check for datastore Client expired tokens used in sensor container

• Add new contributors field to the pack metadata file. This field can contain a list of
  people who have contributed to the pack. The format is Name <email>, e.g.
  Tomaz Muraus <[email protected]> (new feature)

• Update packs.install action (pack install command) to only load resources from the packs
  which are being installed. Also update it and remove "restart sensor container" step from the
  install workflow. This step hasn't been needed for a while now because sensor container
  dynamically reads a list of available sensors from the database and starts the sub processes.
  (improvement)

• Change st2api so that a full execution object is returned instead of an error message, when an
  API client requests cancellation of an execution that is already canceled

• Remove packs.info action because .gitinfo file has been deprecated with the new pack
  management approach. Now pack directories are actual checkouts of the corresponding pack git
  repositories so this file is not needed anymore.

• Speed up short-lived Python runner actions by up to 70%. This way done by re-organizing and
  re-factoring code to avoid expensive imports such as jsonschema, jinja2, kombu and mongoengine
  in the places where those imports are not actually needed and by various other optimizations.
  (improvement)

• Add new st2-validate-pack-config tool for validating config file against a particular config
  schema file. (new-feature)

• Upgrade various internal Python library dependencies to the latest stable versions (gunicorn,
  kombu, six, appscheduler, passlib, python-gnupg, semver, paramiko, python-keyczar, virtualenv).

• Improve performance of GET /executions/views/filters by creating additional indexes on
  executions collection

• Add support for default values and dynamic config values for nested config objects. (new feature,
  improvement)

• Throw a more user-friendly exception if rendering a dynamic configuration value inside the config
  fails. (improvement)

• Add support for ssh config file for ParamikoSSHrunner. Now ssh_config_file_path can be set
  in st2 config and can be used to access remote hosts when use_ssh_config is set to
  True. However, to access remote hosts, action paramters like username and
  password/private_key, if provided with action, will have precedence over the config file
  entry for the host. #2941 #3032 #3058 Eric Edgar

• Fix packs.uninstall action so it also deletes configs and policies which belong to
  the pack which is being uninstalled. (bug fix)

• Fix python action runner actions and make sure that modules from st2common/st2common/runners
  directory don't pollute PYTHONPATH for python runner actions. (bug fix)