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-(expose-the-version-of-the-application-behind-your-charm)=
-# Expose the version of the application behind your charm
-
-> {ref}`From Zero to Hero: Write your first Kubernetes charm ` > Expose the version of the application behind your charm
->
-> **See previous: {ref}`Make your charm configurable `**
-
-````{important}
-
-This document is part of a series, and we recommend you follow it in sequence. However, you can also jump straight in by checking out the code from the previous branches:
-
-```
-git clone https://github.com/canonical/juju-sdk-tutorial-k8s.git
-cd juju-sdk-tutorial-k8s
-git checkout 02_make_your_charm_configurable
-git checkout -b 03_set_workload_version
-```
-
-````
-
-In this chapter of the tutorial you will learn how to expose the version of the application (workload) run by the charm -- something that a charm user might find it useful to know.
-
-**Contents:**
-
-1. [Define functions to collect the workload application version and set it in the charm](#heading--define-functions-to-collect-the-workload-application-version-and-set-it-in-the-charm)
-1. [Declare Python dependencies](#heading--declare-python-dependencies)
-1. [Validate your charm](#heading--validate-your-charm)
-1. [Review the final code](#heading--review-the-final-code)
-
-Define functions to collect the workload application version and set it in the charm
-
-As a first step we need to add two helper functions that will send an HTTP request to our application to get its version. If the container is available, we can send a request using the `requests` Python library and then add class methods to parse the JSON output to get a version string, as shown below:
-
-- Import the `requests` Python library:
-
-```
-import requests
-```
-
-- Add the following class methods:
-
-
-```python
-@property
-def version(self) -> str:
- """Reports the current workload (FastAPI app) version."""
- try:
- if self.container.get_services(self.pebble_service_name):
- return self._request_version()
- # Catching Exception is not ideal, but we don't care much for the error here, and just
- # default to setting a blank version since there isn't much the admin can do!
- except Exception as e:
- logger.warning("unable to get version from API: %s", str(e), exc_info=True)
- return ""
-
-def _request_version(self) -> str:
- """Helper for fetching the version from the running workload using the API."""
- resp = requests.get(f"http://localhost:{self.config['server-port']}/version", timeout=10)
- return resp.json()["version"]
-```
-
-Next, we need to update the `_update_layer_and_restart` method to set our workload version. Insert the following lines before setting `ActiveStatus`:
-
-```python
-# Add workload version in Juju status.
-self.unit.set_workload_version(self.version)
-```
-
-Declare Python dependencies
-
-
-Since we've added a third party Python dependency into our project, we need to list it in `requirements.txt`. Edit the file to add the following line:
-
-```
-requests~=2.28
-```
-
-Next time you run `charmcraft` it will fetch this new dependency into the charm package.
-
-
-Validate your charm
-
-We've exposed the workload version behind our charm. Let's test that it's working!
-
-First, repack and refresh your charm:
-
-```
-charmcraft pack
-juju refresh \
- --path="./demo-api-charm_ubuntu-22.04-amd64.charm" \
- demo-api-charm --force-units --resource \
- demo-server-image=ghcr.io/canonical/api_demo_server:1.0.1
-```
-
-Our charm should fetch the application version and forward it to `juju`. Run `juju status` to check:
-
-```text
-juju status
-```
-
-Indeed, the version of our workload is now displayed -- see the App block, the Version column:
-
-```text
-Model Controller Cloud/Region Version SLA Timestamp
-charm-model tutorial-controller microk8s/localhost 3.0.0 unsupported 12:37:27+01:00
-
-App Version Status Scale Charm Channel Rev Address Exposed Message
-demo-api-charm 1.0.1 active 1 demo-api-charm 0 10.152.183.233 no
-
-Unit Workload Agent Address Ports Message
-demo-api-charm/0* active idle 10.1.157.75
-```
-
-Review the final code
-
-
-For the full code see: [03_set_workload_version](https://github.com/canonical/juju-sdk-tutorial-k8s/tree/03_set_workload_version)
-
-For a comparative view of the code before and after this doc see: [Comparison](https://github.com/canonical/juju-sdk-tutorial-k8s/compare/02_make_your_charm_configurable...03_set_workload_version)
-
-
-> **See next: {ref}`Integrate your charm with PostgreSQL `**
-
-> Contributors: @beliaev-maksim
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