Add endpoint system df information

[erwindouna]

Breaking change

Proposed change

Adds new system df information per endpoint, including reclaimable disk space.
Needs a git rebase, once #160130 is merged, to remove the requirements files and manifest.json to be properly updated.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:
• Link to developer documentation pull request:
• Link to frontend pull request:

Checklist

• I understand the code I am submitting and can explain how it works.
• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.
• Any generated code has been carefully reviewed for correctness and compliance with project standards.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[Copilot]

Pull request overview

This PR adds Docker system disk usage information to the Portainer integration, enabling monitoring of reclaimable disk space per endpoint. The changes depend on the pyportainer library upgrade from version 1.0.19 to 1.0.21 (PR #160130), which adds the necessary API endpoints for retrieving system df data.

Key Changes

• Added five new diagnostic sensors to track disk usage metrics for containers, images, and volumes
• Integrated docker_system_df API call into the coordinator's data update cycle
• Updated dependency to pyportainer 1.0.21

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
homeassistant/components/portainer/sensor.py	Added 5 new sensor entity descriptions for disk usage metrics (reclaimable/total size for containers and images, total size for volumes)
homeassistant/components/portainer/coordinator.py	Integrated docker_system_df API call and added DockerSystemDF to coordinator data model
homeassistant/components/portainer/strings.json	Added translation keys for the new disk usage sensor entities
homeassistant/components/portainer/icons.json	Added icons (file-restore, harddisk) for the new disk usage sensors
homeassistant/components/portainer/manifest.json	Updated pyportainer requirement from 1.0.19 to 1.0.21
requirements_all.txt	Updated pyportainer version to 1.0.21
requirements_test_all.txt	Updated pyportainer version to 1.0.21
tests/components/portainer/conftest.py	Added DockerSystemDF mock return value to test client setup
tests/components/portainer/fixtures/docker_system_df.json	Added test fixture with sample disk usage data for images, containers, volumes, and build cache

[mik-laj]

As this integration grows more and more, we may consider not downloading all the data every time, but only the data that is needed.

systemmonitor implements such a pattern:

core/homeassistant/components/systemmonitor/coordinator.py

Lines 122 to 147 in 3b2a7ba

	self._initial_update: bool = True
	self.update_subscribers: dict[tuple[str, str], set[str]] = (
	self.set_subscribers_tuples(arguments)
	)
	def set_subscribers_tuples(
	self, arguments: list[str]
	) -> dict[tuple[str, str], set[str]]:
	"""Set tuples in subscribers dictionary."""
	_disk_defaults: dict[tuple[str, str], set[str]] = {}
	for argument in arguments:
	_disk_defaults[("disks", argument)] = set()
	return {
	**_disk_defaults,
	("addresses", ""): set(),
	("battery", ""): set(),
	("boot", ""): set(),
	("cpu_percent", ""): set(),
	("fan_speed", ""): set(),
	("io_counters", ""): set(),
	("load", ""): set(),
	("memory", ""): set(),
	("processes", ""): set(),
	("swap", ""): set(),
	("temperatures", ""): set(),
	}

core/homeassistant/components/systemmonitor/coordinator.py

Lines 153 to 163 in 3b2a7ba

	_data = await self.hass.async_add_executor_job(self.update_data)
	load: tuple = (None, None, None)
	if self.update_subscribers[("load", "")] or self._initial_update:
	load = os.getloadavg()
	_LOGGER.debug("Load: %s", load)
	cpu_percent: float | None = None
	if self.update_subscribers[("cpu_percent", "")] or self._initial_update:
	cpu_percent = self._psutil.cpu_percent(interval=None)
	_LOGGER.debug("cpu_percent: %s", cpu_percent)

core/homeassistant/components/systemmonitor/sensor.py

Lines 661 to 673 in 3b2a7ba

	async def async_added_to_hass(self) -> None:
	"""When added to hass."""
	self.coordinator.update_subscribers[
	self.entity_description.add_to_update(self)
	].add(self.entity_id)
	return await super().async_added_to_hass()
	async def async_will_remove_from_hass(self) -> None:
	"""When removed from hass."""
	self.coordinator.update_subscribers[
	self.entity_description.add_to_update(self)
	].remove(self.entity_id)
	return await super().async_will_remove_from_hass()