diff --git a/docs/source/changelog.rst b/docs/source/changelog.rst
index ccd0c0be..3f2e5409 100644
--- a/docs/source/changelog.rst
+++ b/docs/source/changelog.rst
@@ -1,4 +1,4 @@
-.. Created by changelog.py at 2020-02-24, command
+.. Created by changelog.py at 2020-02-26, command
    '/Users/giffler/.cache/pre-commit/repont7o94ca/py_env-default/bin/changelog docs/source/changes compile --output=docs/source/changelog.rst'
    based on the format of 'https://keepachangelog.com/'
 
@@ -6,8 +6,8 @@
 CHANGELOG
 #########
 
-[Unreleased] - 2020-02-24
-=========================
+[0.3.0] - 2020-02-26
+====================
 
 Added
 -----
diff --git a/docs/source/changes/100.fix_transition_within_cleanupstate.yaml b/docs/source/changes/100.fix_transition_within_cleanupstate.yaml
index 5f824ef1..5a9a879d 100644
--- a/docs/source/changes/100.fix_transition_within_cleanupstate.yaml
+++ b/docs/source/changes/100.fix_transition_within_cleanupstate.yaml
@@ -1,7 +1,9 @@
 category: fixed
-summary: The `CleanupState` is now taking into account the status of the resource for state transitions
-pull requests:
-  - 100
+summary: "The `CleanupState` is now taking into account the status of the resource\
+  \ for state transitions"
 description: |
   The `CleanupState` is now taking into account the status of the resource and two missing state transitions have been
   added to the transistion dictionary.
+pull requests:
+- 100
+version: 0.3.0
diff --git a/docs/source/changes/116.adding_drone_life_time.yaml b/docs/source/changes/116.adding_drone_life_time.yaml
index 453de816..3d271659 100644
--- a/docs/source/changes/116.adding_drone_life_time.yaml
+++ b/docs/source/changes/116.adding_drone_life_time.yaml
@@ -1,9 +1,10 @@
 category: added
-summary: An optional and per site configurable drone minimum lifetime has been added
-pull requests:
-  - 116
-issues:
-  - 114
+summary: "An optional and per site configurable drone minimum lifetime has been added"
 description: |
   An optionally and per site configurable drone minimum life time to TARDIS. The minimum life time is defined as the
   time the drone is being in `AvailableState`. At the end of life, the drone is set to `DrainState`.
+issues:
+- 114
+pull requests:
+- 116
+version: 0.3.0
diff --git a/docs/source/changes/119.add_legacy_object_initialisation.yaml b/docs/source/changes/119.add_legacy_object_initialisation.yaml
index 1fb244d5..7f46ce3f 100644
--- a/docs/source/changes/119.add_legacy_object_initialisation.yaml
+++ b/docs/source/changes/119.add_legacy_object_initialisation.yaml
@@ -1,9 +1,10 @@
 category: added
-summary: Add support for COBalD legacy object initialisation
-pull requests:
-  - 119
-issues:
-  - 118
+summary: "Add support for COBalD legacy object initialisation"
 description: |
   Support for the `COBalD` object initialisation syntax to construct python objects instead of using YAML tags has been
   enabled.
+issues:
+- 118
+pull requests:
+- 119
+version: 0.3.0
diff --git a/docs/source/changes/120.add_python38_support.yaml b/docs/source/changes/120.add_python38_support.yaml
index 5ec81026..977c7861 100644
--- a/docs/source/changes/120.add_python38_support.yaml
+++ b/docs/source/changes/120.add_python38_support.yaml
@@ -1,6 +1,7 @@
 category: added
-summary: Add support for Python 3.8
-pull requests:
-  - 120
+summary: "Add support for Python 3.8"
 description: |
   Support for Python3.8 added to setup.py classifiers and travis uniitests for Python3.8 have been enabled.
+pull requests:
+- 120
+version: 0.3.0
diff --git a/docs/source/changes/122.fix_state_transitions_for_retried_jobs.yaml b/docs/source/changes/122.fix_state_transitions_for_retried_jobs.yaml
index 2faa2829..930b2524 100644
--- a/docs/source/changes/122.fix_state_transitions_for_retried_jobs.yaml
+++ b/docs/source/changes/122.fix_state_transitions_for_retried_jobs.yaml
@@ -1,9 +1,8 @@
 category: fixed
-summary: Fix state transitions for jobs retried by HTCondor
-pull_requests:
-  - 122
+summary: "Fix state transitions for jobs retried by HTCondor"
 description: |
   In case a job is in `DrainingState`, `ShuttingDownState` or `ShutDownState` a transition back to BootingState is
   currently not covered by `TARDIS`. However, a currently running job can potentially be retried by HTCondor in case of
   an internal error. Now, retried jobs previously in `DrainingState`, `ShuttingDownState` or `ShutDownState` are removed
   entirely from the batch queue.
+version: 0.3.0
diff --git a/docs/source/changes/123.fix_draining_slots_w_startd_name.yaml b/docs/source/changes/123.fix_draining_slots_w_startd_name.yaml
index 02e3fa02..091930e9 100644
--- a/docs/source/changes/123.fix_draining_slots_w_startd_name.yaml
+++ b/docs/source/changes/123.fix_draining_slots_w_startd_name.yaml
@@ -1,8 +1,9 @@
 category: fixed
 summary: "Fix draining of slots having a startd name"
-pull requests:
-  - 123
 description: |
   `TARDIS` supports running more than one Drone on the same host. To differentiate the drones, the `TardisDroneUuid` has
   been introduced and will be set as `STARTD_NAME` on the corresponding sites. `TARDIS` used to use only the `hostname`
   when draining resources. This change will take into account the provided `STARTD_NAME` as well.
+pull requests:
+- 123
+version: 0.3.0
diff --git a/docs/source/changes/125.add_unified_configuration.yaml b/docs/source/changes/125.add_unified_configuration.yaml
index 74847ac0..725152f0 100644
--- a/docs/source/changes/125.add_unified_configuration.yaml
+++ b/docs/source/changes/125.add_unified_configuration.yaml
@@ -1,6 +1,7 @@
 category: added
-summary: Add the possibility to use an unified `COBalD` and `TARDIS` configuration
-pull requests:
-  - 125
+summary: "Add the possibility to use an unified `COBalD` and `TARDIS` configuration"
 description: |
   The possibility to combine the `COBalD` and the `TARDIS` configuration in one single `yaml` has been added.
+pull requests:
+- 125
+version: 0.3.0
diff --git a/docs/source/changes/126.fix_config_translation.yaml b/docs/source/changes/126.fix_config_translation.yaml
index d25fd884..000eac96 100644
--- a/docs/source/changes/126.fix_config_translation.yaml
+++ b/docs/source/changes/126.fix_config_translation.yaml
@@ -1,7 +1,7 @@
 category: fixed
-summary: Fix the translation of cloud init scripts into base64 encoded strings
+summary: "Fix the translation of cloud init scripts into base64 encoded strings"
+description: "The translation of cloud init scripts into base64 encoded strings has\
+  \ been fixed. Reason was changing a data structure\nwhile interating over it. \n"
 pull requests:
-  - 126
-description: |
-  The translation of cloud init scripts into base64 encoded strings has been fixed. Reason was changing a data structure
-  while interating over it. 
+- 126
+version: 0.3.0
diff --git a/docs/source/changes/127.fix_use_utilisation_as_weight_in_composite_pools.yaml b/docs/source/changes/127.fix_use_utilisation_as_weight_in_composite_pools.yaml
index 252e0340..d171a815 100644
--- a/docs/source/changes/127.fix_use_utilisation_as_weight_in_composite_pools.yaml
+++ b/docs/source/changes/127.fix_use_utilisation_as_weight_in_composite_pools.yaml
@@ -1,8 +1,9 @@
 category: fixed
-summary: Use utilisation as weight in composite pools
-pull requests:
-  - 127
+summary: "Use utilisation as weight in composite pools"
 description: |
   The experience of using `WeightedComposite` pools in production shows that weighting the `demand` of resources by
   their `supply` is not always the best choice. Weighting the `demand` of resources by `utilisation` is instead more
   desired, since `COBalD` should increase the best utilised resource.
+pull requests:
+- 127
+version: 0.3.0
diff --git a/docs/source/changes/128.fix_state_transitions_in_slurm_adapter.yaml b/docs/source/changes/128.fix_state_transitions_in_slurm_adapter.yaml
index 0050b73a..d279d086 100644
--- a/docs/source/changes/128.fix_state_transitions_in_slurm_adapter.yaml
+++ b/docs/source/changes/128.fix_state_transitions_in_slurm_adapter.yaml
@@ -1,9 +1,10 @@
 category: fixed
-summary: Fix state transitions and refactoring of the SLURM site adapter
-pull requests:
-  - 128
+summary: "Fix state transitions and refactoring of the SLURM site adapter"
 description: |
   The SLURM site adapter contains now state transition for all possible job states in the SLURM batch system. For some
   states the transition to `TARDIS` `resources_states` has been corrected leading to an infinite execution of `scancel`
   to jobs not in the queue anymore. In addtion, `squeue` (jobs in batch queue) instead of the `sacct`
   (Accounting tool listing also history of jobs) is used in order to minize the number of jobs to keep track of.
+pull requests:
+- 128
+version: 0.3.0
diff --git a/docs/source/changes/76.allow_removal_of_booting_drones.yaml b/docs/source/changes/76.allow_removal_of_booting_drones.yaml
index 70a587f7..6a2924f6 100644
--- a/docs/source/changes/76.allow_removal_of_booting_drones.yaml
+++ b/docs/source/changes/76.allow_removal_of_booting_drones.yaml
@@ -1,8 +1,9 @@
 category: fixed
-summary: Allow removal of booting drones if demand drops to zero
-pull requests:
-  - 76
+summary: "Allow removal of booting drones if demand drops to zero"
 description: |
   So far draining of drones in `AvailableState` was supported by `TARDIS`, which works well for cloud providers. Since
   the queueing time in batch systems can be long, the deletion of queued drones (idle batch jobs) has been enabled as
   well.
+pull requests:
+- 76
+version: 0.3.0
diff --git a/docs/source/changes/77.telegraf_config_update.yaml b/docs/source/changes/77.telegraf_config_update.yaml
index edc44f77..501e3017 100644
--- a/docs/source/changes/77.telegraf_config_update.yaml
+++ b/docs/source/changes/77.telegraf_config_update.yaml
@@ -1,7 +1,9 @@
 category: added
-summary: The machine name has been added as a default tag in the telegraf monitoring plugin, can be overwritten.
-pull requests:
-  - 77
+summary: "The machine name has been added as a default tag in the telegraf monitoring\
+  \ plugin, can be overwritten."
 description: |
   The machine name has been added as a default tag in the telegraf monitoring plugin. Can be overwritten by adding
   `tardis_machine_name` as default tag in the plugin configuration.
+pull requests:
+- 77
+version: 0.3.0
diff --git a/docs/source/changes/78.improve_logging_of_htcondor_batch_adapter.yaml b/docs/source/changes/78.improve_logging_of_htcondor_batch_adapter.yaml
index 5e0d830f..fc1653c1 100644
--- a/docs/source/changes/78.improve_logging_of_htcondor_batch_adapter.yaml
+++ b/docs/source/changes/78.improve_logging_of_htcondor_batch_adapter.yaml
@@ -1,7 +1,9 @@
 category: fixed
-summary: Improved logging of the `HTCondor` batch system adapter and the status changes of the drones
-pull requests:
-  - 78
+summary: "Improved logging of the `HTCondor` batch system adapter and the status changes\
+  \ of the drones"
 description: |
   Drone resource attributes to have been addedd to the debug logging of drone status changes. The `condor_status`
   command has been added to the debug logging of the htcondor batch system adapter.
+pull requests:
+- 78
+version: 0.3.0
diff --git a/docs/source/changes/92.register_pool_factory_as_yaml_plugin.yaml b/docs/source/changes/92.register_pool_factory_as_yaml_plugin.yaml
index 5526f47c..65efd1c4 100644
--- a/docs/source/changes/92.register_pool_factory_as_yaml_plugin.yaml
+++ b/docs/source/changes/92.register_pool_factory_as_yaml_plugin.yaml
@@ -1,9 +1,10 @@
 category: added
-summary: Register pool factory as `COBalD` yaml plugin
-pull requests:
-  - 92
-issues:
-  - 91
+summary: "Register pool factory as `COBalD` yaml plugin"
 description: |
   Register the composite pool factory function `create_composite_pool` as `COBalD` yaml plugin, so that it can be loaded
   via yaml tags in the `COBalD` configuration.
+issues:
+- 91
+pull requests:
+- 92
+version: 0.3.0
diff --git a/docs/source/changes/96.fix_handling_of_vanished_resources.yaml b/docs/source/changes/96.fix_handling_of_vanished_resources.yaml
index 9807d51d..a47b86b3 100644
--- a/docs/source/changes/96.fix_handling_of_vanished_resources.yaml
+++ b/docs/source/changes/96.fix_handling_of_vanished_resources.yaml
@@ -1,8 +1,9 @@
 category: fixed
-summary: Fix the handling of the termination of vanished resources
-pull requests:
-  - 96
+summary: "Fix the handling of the termination of vanished resources"
 description: |
   Fix a bug with resources that shut down itself while being idle for 20 minutes, which remained in `CleanUpState`
   forever, since the `teminate_resource` call keept raising `TardisResourceStatusUpdateFailed`, which led to infinte
   retries of the `terminate_resource` call.
+pull requests:
+- 96
+version: 0.3.0
diff --git a/docs/source/changes/versions.yaml b/docs/source/changes/versions.yaml
new file mode 100644
index 00000000..c3b8059f
--- /dev/null
+++ b/docs/source/changes/versions.yaml
@@ -0,0 +1,2 @@
+- semver: 0.3.0
+  date: '2020-02-26'
diff --git a/docs/source/executors/executors.rst b/docs/source/executors/executors.rst
index 711d4442..f0a1398c 100644
--- a/docs/source/executors/executors.rst
+++ b/docs/source/executors/executors.rst
@@ -28,7 +28,7 @@ Shell Executor
 
     .. code-block:: yaml
 
-      !ShellExecutor
+      !TardisShellExecutor
 
     .. rubric:: Example configuration (`COBalD` legacy object initialisation)
 
@@ -53,7 +53,7 @@ SSH Executor
 
     .. code-block:: yaml
 
-      !SSHExecutor
+      !TardisSSHExecutor
         host: login.dorie.somewherein.de
         username: clown
         client_keys:
diff --git a/setup.py b/setup.py
index b4005f50..a0de4ea3 100644
--- a/setup.py
+++ b/setup.py
@@ -40,7 +40,11 @@
     ],
     entry_points={
         "cobald.config.yaml_constructors": [
-            "TardisPoolFactory = tardis.resources.poolfactory:create_composite_pool"
+            "TardisPoolFactory = tardis.resources.poolfactory:create_composite_pool",
+            "TardisPeriodicValue = tardis.utilities.simulators.periodicvalue:PeriodicValue",  # noqa: B950
+            "TardisRandomGauss = tardis.utilities.simulators.randomgauss:RandomGauss",
+            "TardisSSHExecutor = tardis.utilities.executors.sshexecutor:SSHExecutor",
+            "TardisShellExecutor = tardis.utilities.executors.shellexecutor:ShellExecutor",  # noqa: B950
         ],
         "cobald.config.sections": [
             "tardis = tardis.configuration.configuration:Configuration"
@@ -53,7 +57,7 @@
         "CloudStackAIO",
         "PyYAML",
         "AsyncOpenStackClient",
-        "cobald",
+        "cobald>=0.12.0",
         "asyncssh",
         "aiotelegraf",
     ],
diff --git a/tardis/__about__.py b/tardis/__about__.py
index 70ca7797..896682aa 100644
--- a/tardis/__about__.py
+++ b/tardis/__about__.py
@@ -3,7 +3,7 @@
 __summary__ = "Transparent Adaptive Resource Dynamic Integration System"
 __url__ = "https://github.com/matterminers/tardis"
 
-__version__ = "0.2.0"
+__version__ = "0.3.0"
 __author__ = "Manuel Giffels, Matthias Schnepf"
 __email__ = "giffels@gmail.com"
 __copyright__ = "2019 %s" % __author__
diff --git a/tardis/configuration/configuration.py b/tardis/configuration/configuration.py
index 76498b99..df8b64d2 100644
--- a/tardis/configuration/configuration.py
+++ b/tardis/configuration/configuration.py
@@ -7,6 +7,7 @@
 from ..utilities.simulators import *  # noqa: F403, F401
 
 from cobald.daemon.config.mapping import Translator
+from cobald.daemon.plugins import constraints as plugin_constraints
 
 from base64 import b64encode
 import os
@@ -31,6 +32,7 @@ def translate_config(obj):
         return obj
 
 
+@plugin_constraints(before={"pipeline"})
 class Configuration(Borg):
     _shared_state = AttributeDict()