diff --git a/cou/apps/base.py b/cou/apps/base.py
index e0e6f9c8..63abcb31 100644
--- a/cou/apps/base.py
+++ b/cou/apps/base.py
@@ -18,10 +18,9 @@
 import logging
 from collections import defaultdict
 from dataclasses import dataclass, field
-from io import StringIO
 from typing import Any, Iterable, Optional
 
-from ruamel.yaml import YAML
+import yaml
 
 from cou.exceptions import (
     ApplicationError,
@@ -46,6 +45,8 @@
 logger = logging.getLogger(__name__)
 
 DEFAULT_WAITING_TIMEOUT = 5 * 60  # 5 min
+ORIGIN_SETTINGS = ("openstack-origin", "source")
+REQUIRED_SETTINGS = ("enable-auto-restarts", "action-managed-upgrade", *ORIGIN_SETTINGS)
 
 
 @dataclass(frozen=True)
@@ -99,23 +100,38 @@ def __str__(self) -> str:
         summary = {
             self.name: {
                 "model_name": self.model.name,
+                "can_upgrade_to": self.can_upgrade_to,
                 "charm": self.charm,
-                "charm_origin": self.origin,
-                "os_origin": self.os_origin,
                 "channel": self.channel,
+                # Note (rgildein): sanitized the config
+                "config": {
+                    key: self.config[key] for key in self.config if key in REQUIRED_SETTINGS
+                },
+                "origin": self.origin,
+                "series": self.series,
+                "subordinate_to": self.subordinate_to,
+                "workload_version": self.workload_version,
                 "units": {
                     unit.name: {
+                        "name": unit.name,
+                        "machine": unit.machine.machine_id,
                         "workload_version": unit.workload_version,
                         "os_version": str(self._get_latest_os_version(unit)),
                     }
                     for unit in self.units.values()
                 },
+                "machines": {
+                    machine.machine_id: {
+                        "id": machine.machine_id,
+                        "apps": machine.apps,
+                        "az": machine.az,
+                    }
+                    for machine in self.machines.values()
+                },
             }
         }
-        yaml = YAML()
-        with StringIO() as stream:
-            yaml.dump(summary, stream)
-            return stream.getvalue()
+
+        return yaml.dump(summary, sort_keys=False)
 
     def _verify_channel(self) -> None:
         """Verify app channel from current data.
@@ -155,7 +171,7 @@ def origin_setting(self) -> Optional[str]:
         :return: return name of charm origin setting, e.g. "source", "openstack-origin" or None
         :rtype: Optional[str]
         """
-        for origin in ("openstack-origin", "source"):
+        for origin in ORIGIN_SETTINGS:
             if origin in self.config:
                 return origin
 
@@ -410,18 +426,17 @@ def generate_upgrade_plan(
         :return: Full upgrade plan if the Application is able to generate it.
         :rtype: ApplicationUpgradePlan
         """
-        upgrade_steps = ApplicationUpgradePlan(
+        upgrade_plan = ApplicationUpgradePlan(
             description=f"Upgrade plan for '{self.name}' to {target}",
         )
-        all_steps = (
-            self.pre_upgrade_steps(target, units)
-            + self.upgrade_steps(target, units, force)
-            + self.post_upgrade_steps(target, units)
-        )
-        for step in all_steps:
-            if step:
-                upgrade_steps.add_step(step)
-        return upgrade_steps
+
+        upgrade_plan.sub_steps = [
+            *self.pre_upgrade_steps(target, units),
+            *self.upgrade_steps(target, units, force),
+            *self.post_upgrade_steps(target, units),
+        ]
+
+        return upgrade_plan
 
     def _get_upgrade_current_release_packages_step(
         self, units: Optional[list[COUUnit]]
@@ -471,10 +486,8 @@ def _get_refresh_charm_step(self, target: OpenStackRelease) -> PreUpgradeStep:
         # corner case for rabbitmq and hacluster.
         if len(self.possible_current_channels) > 1:
             logger.info(
-                (
-                    "'%s' has more than one channel compatible with the current OpenStack "
-                    "release: '%s'. '%s' will be used"
-                ),
+                "'%s' has more than one channel compatible with the current OpenStack release: "
+                "'%s'. '%s' will be used",
                 self.name,
                 self.current_os_release.codename,
                 channel,
@@ -574,7 +587,7 @@ def _get_resume_unit_step(self, unit: COUUnit, dependent: bool = False) -> UnitU
         :rtype: UnitUpgradeStep
         """
         return UnitUpgradeStep(
-            description=(f"Resume the unit: '{unit.name}'."),
+            description=f"Resume the unit: '{unit.name}'.",
             coro=self.model.run_action(
                 unit_name=unit.name, action_name="resume", raise_on_failure=True
             ),
diff --git a/cou/steps/__init__.py b/cou/steps/__init__.py
index 4762236b..b8bff049 100644
--- a/cou/steps/__init__.py
+++ b/cou/steps/__init__.py
@@ -188,6 +188,7 @@ def description(self, description: str) -> None:
         """
         if not description and self._coro:
             raise ValueError("Every coroutine should have a description")
+
         self._description = description
 
     @property
@@ -244,6 +245,10 @@ def add_step(self, step: BaseStep) -> None:
         if not isinstance(step, BaseStep):
             raise TypeError("Cannot add an upgrade step that is not derived from BaseStep")
 
+        if not step:
+            logger.debug("skipping adding empty step")
+            return
+
         self._sub_steps.append(step)
 
     def cancel(self, safe: bool = True) -> None:
diff --git a/setup.cfg b/setup.cfg
index 66cb3ed3..8f7c46aa 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -28,7 +28,6 @@ install_requires =
     oslo.config
     juju<3.0
     colorama
-    ruamel.yaml
     packaging
     aioconsole
     halo
diff --git a/tests/unit/apps/test_core.py b/tests/unit/apps/test_core.py
index d39f44a2..9230e112 100644
--- a/tests/unit/apps/test_core.py
+++ b/tests/unit/apps/test_core.py
@@ -890,7 +890,7 @@ def test_nova_compute_upgrade_plan(model):
             Upgrade software packages on unit nova-compute/1
             Upgrade software packages on unit nova-compute/2
         Refresh 'nova-compute' to the latest revision of 'ussuri/stable'
-        Change charm config of 'nova-compute' 'action-managed-upgrade' to True.
+        Change charm config of 'nova-compute' 'action-managed-upgrade' to True
         Upgrade 'nova-compute' to the new channel: 'victoria/stable'
         Change charm config of 'nova-compute' 'source' to 'cloud:focal-victoria'
         Upgrade plan for units: nova-compute/0, nova-compute/1, nova-compute/2
@@ -933,7 +933,7 @@ def test_nova_compute_upgrade_plan(model):
         can_upgrade_to="ussuri/stable",
         charm="nova-compute",
         channel="ussuri/stable",
-        config={"source": {"value": "distro"}},
+        config={"source": {"value": "distro"}, "action-managed-upgrade": {"value": False}},
         machines=machines,
         model=model,
         origin="ch",
@@ -957,7 +957,7 @@ def test_nova_compute_upgrade_plan_single_unit(model):
         Upgrade software packages of 'nova-compute' from the current APT repositories
             Upgrade software packages on unit nova-compute/0
         Refresh 'nova-compute' to the latest revision of 'ussuri/stable'
-        Change charm config of 'nova-compute' 'action-managed-upgrade' to True.
+        Change charm config of 'nova-compute' 'action-managed-upgrade' to True
         Upgrade 'nova-compute' to the new channel: 'victoria/stable'
         Change charm config of 'nova-compute' 'source' to 'cloud:focal-victoria'
         Upgrade plan for units: nova-compute/0
@@ -986,7 +986,7 @@ def test_nova_compute_upgrade_plan_single_unit(model):
         can_upgrade_to="ussuri/stable",
         charm="nova-compute",
         channel="ussuri/stable",
-        config={"source": {"value": "distro"}},
+        config={"source": {"value": "distro"}, "action-managed-upgrade": {"value": False}},
         machines=machines,
         model=model,
         origin="ch",
diff --git a/tests/unit/steps/test_steps.py b/tests/unit/steps/test_steps.py
index 2c1abf34..70c5ad56 100644
--- a/tests/unit/steps/test_steps.py
+++ b/tests/unit/steps/test_steps.py
@@ -115,12 +115,14 @@ def test_step_bool():
     sub_step = BaseStep(description="a.a")
     assert bool(sub_step) is False
 
-    plan.sub_steps = [sub_step]
+    plan.add_step(sub_step)
     assert bool(plan) is False
 
     # coroutine in the plan sub_steps tree
     sub_sub_step = BaseStep(description="a.a.a", coro=mock_coro("a.a.a"))
-    sub_step.sub_steps = [sub_sub_step]
+    sub_step.add_step(sub_sub_step)
+    plan.add_step(sub_step)
+
     assert bool(sub_sub_step) is True
     assert bool(sub_step) is True
     assert bool(plan) is True
@@ -225,6 +227,16 @@ def test_step_add_step():
     exp_sub_steps = 3
     plan = BaseStep(description="plan")
     for i in range(exp_sub_steps):
+        plan.add_step(BaseStep(description=f"sub-step-{i}", coro=mock_coro()))
+
+    assert len(plan.sub_steps) == exp_sub_steps
+
+
+def test_step_add_step_skipping_empty():
+    """Test BaseStep skipping to add empty sub steps."""
+    exp_sub_steps = 0
+    plan = BaseStep(description="plan")
+    for i in range(3):
         plan.add_step(BaseStep(description=f"sub-step-{i}"))
 
     assert len(plan.sub_steps) == exp_sub_steps
@@ -242,9 +254,13 @@ def test_step_add_step_failed():
 def test_step_cancel_safe():
     """Test step safe cancel."""
     plan = BaseStep(description="plan")
-    plan.sub_steps = sub_steps = [BaseStep(description=f"sub-{i}") for i in range(10)]
+    plan.sub_steps = sub_steps = [
+        BaseStep(description=f"sub-{i}", coro=mock_coro()) for i in range(10)
+    ]
     # add sub-sub-steps to one sub-step
-    sub_steps[0].sub_steps = [BaseStep(description=f"sub-0.{i}") for i in range(3)]
+    sub_steps[0].sub_steps = [
+        BaseStep(description=f"sub-0.{i}", coro=mock_coro()) for i in range(3)
+    ]
 
     plan.cancel()
 
diff --git a/tests/unit/steps/test_steps_analyze.py b/tests/unit/steps/test_steps_analyze.py
index 34276b77..a82caa7a 100644
--- a/tests/unit/steps/test_steps_analyze.py
+++ b/tests/unit/steps/test_steps_analyze.py
@@ -11,6 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+from textwrap import dedent
 from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
@@ -22,61 +23,129 @@
 from cou.steps.analyze import Analysis
 from cou.utils.juju_utils import COUApplication, COUMachine, COUUnit
 from cou.utils.openstack import OpenStackRelease
+from tests.unit.utils import generate_cou_machine
 
 
 def test_analysis_dump(model):
     """Test analysis dump."""
-    expected_result = (
-        "Control Plane:\n"
-        "keystone:\n"
-        "  model_name: test_model\n"
-        "  charm: keystone\n"
-        "  charm_origin: ch\n"
-        "  os_origin: distro\n"
-        "  channel: ussuri/stable\n"
-        "  units:\n"
-        "    keystone/0:\n"
-        "      workload_version: 17.0.1\n"
-        "      os_version: ussuri\n"
-        "    keystone/1:\n"
-        "      workload_version: 17.0.1\n"
-        "      os_version: ussuri\n"
-        "    keystone/2:\n"
-        "      workload_version: 17.0.1\n"
-        "      os_version: ussuri\n"
-        "\n"
-        "cinder:\n"
-        "  model_name: test_model\n"
-        "  charm: cinder\n"
-        "  charm_origin: ch\n"
-        "  os_origin: distro\n"
-        "  channel: ussuri/stable\n"
-        "  units:\n"
-        "    cinder/0:\n"
-        "      workload_version: 16.4.2\n"
-        "      os_version: ussuri\n"
-        "    cinder/1:\n"
-        "      workload_version: 16.4.2\n"
-        "      os_version: ussuri\n"
-        "    cinder/2:\n"
-        "      workload_version: 16.4.2\n"
-        "      os_version: ussuri\n"
-        "\n"
-        "rabbitmq-server:\n"
-        "  model_name: test_model\n"
-        "  charm: rabbitmq-server\n"
-        "  charm_origin: ch\n"
-        "  os_origin: distro\n"
-        "  channel: 3.8/stable\n"
-        "  units:\n"
-        "    rabbitmq-server/0:\n"
-        "      workload_version: '3.8'\n"
-        "      os_version: yoga\n"
-        "Data Plane:\n"
-        "\nCurrent minimum OS release in the cloud: ussuri\n"
-        "\nCurrent minimum Ubuntu series in the cloud: focal\n"
+    expected_result = dedent(
+        """\
+        Control Plane:
+        keystone:
+          model_name: test_model
+          can_upgrade_to: ussuri/stable
+          charm: keystone
+          channel: ussuri/stable
+          config:
+            source:
+              value: distro
+          origin: ch
+          series: focal
+          subordinate_to: []
+          workload_version: 17.0.1
+          units:
+            keystone/0:
+              name: keystone/0
+              machine: '0'
+              workload_version: 17.0.1
+              os_version: ussuri
+            keystone/1:
+              name: keystone/1
+              machine: '1'
+              workload_version: 17.0.1
+              os_version: ussuri
+            keystone/2:
+              name: keystone/2
+              machine: '2'
+              workload_version: 17.0.1
+              os_version: ussuri
+          machines:
+            '0':
+              id: '0'
+              apps: !!python/tuple []
+              az: null
+            '1':
+              id: '1'
+              apps: !!python/tuple []
+              az: null
+            '2':
+              id: '2'
+              apps: !!python/tuple []
+              az: null
+
+        cinder:
+          model_name: test_model
+          can_upgrade_to: ussuri/stable
+          charm: cinder
+          channel: ussuri/stable
+          config:
+            source:
+              value: distro
+          origin: ch
+          series: focal
+          subordinate_to: []
+          workload_version: 16.4.2
+          units:
+            cinder/0:
+              name: cinder/0
+              machine: '0'
+              workload_version: 16.4.2
+              os_version: ussuri
+            cinder/1:
+              name: cinder/1
+              machine: '1'
+              workload_version: 16.4.2
+              os_version: ussuri
+            cinder/2:
+              name: cinder/2
+              machine: '2'
+              workload_version: 16.4.2
+              os_version: ussuri
+          machines:
+            '0':
+              id: '0'
+              apps: !!python/tuple []
+              az: null
+            '1':
+              id: '1'
+              apps: !!python/tuple []
+              az: null
+            '2':
+              id: '2'
+              apps: !!python/tuple []
+              az: null
+
+        rabbitmq-server:
+          model_name: test_model
+          can_upgrade_to: 3.8/stable
+          charm: rabbitmq-server
+          channel: 3.8/stable
+          config:
+            source:
+              value: distro
+          origin: ch
+          series: focal
+          subordinate_to: []
+          workload_version: '3.8'
+          units:
+            rabbitmq-server/0:
+              name: rabbitmq-server/0
+              machine: '0'
+              workload_version: '3.8'
+              os_version: yoga
+          machines:
+            '0':
+              id: '0'
+              apps: !!python/tuple []
+              az: null
+        Data Plane:
+
+        Current minimum OS release in the cloud: ussuri
+
+        Current minimum Ubuntu series in the cloud: focal
+        """
     )
-    machines = {f"{i}": MagicMock(spec_set=COUMachine) for i in range(3)}
+    machines = {f"{i}": generate_cou_machine(f"{i}") for i in range(3)}
     keystone = Keystone(
         name="keystone",
         can_upgrade_to="ussuri/stable",
@@ -142,6 +211,7 @@ def test_analysis_dump(model):
         apps_control_plane=[keystone, cinder, rabbitmq_server],
         apps_data_plane=[],
     )
+
     assert str(result) == expected_result
 
 
diff --git a/tests/unit/utils.py b/tests/unit/utils.py
index 6909932d..8061a051 100644
--- a/tests/unit/utils.py
+++ b/tests/unit/utils.py
@@ -29,6 +29,7 @@ def generate_cou_machine(machine_id: str, az: str | None = None) -> MagicMock:
     machine = MagicMock(spec_set=COUMachine)()
     machine.machine_id = machine_id
     machine.az = az
+    machine.apps = tuple()
     return machine