fix(blackbox_exporter): blackbox dependencies syntax

[kuba-orlik]

Fixes #667

The yaml syntax was such that the dependency list was a string ("['python3-apt', 'libcap2-bin'] " — note the whitespace at the end!), not a list, and caused errors described in #667

[github-actions]

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The docs for this PR have been published here:
https://prometheus-community.github.io/ansible/pr/668

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• M _common_role.html

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diff --git a/home/runner/work/ansible/ansible/docsbuild/base/_common_role.html b/home/runner/work/ansible/ansible/docsbuild/head/_common_role.html
index 46c59b8..8d1b8a3 100644
--- a/home/runner/work/ansible/ansible/docsbuild/base/_common_role.html
+++ b/home/runner/work/ansible/ansible/docsbuild/head/_common_role.html
@@ -412,7 +412,7 @@ To check whether it is installed, run <code class="code docutils literal notrans
 <a class="ansibleOptionLink" href="#parameter-preflight--_common_dependencies" title="Permalink to this option"></a><p class="ansible-option-type-line"><span class="ansible-option-type">string</span></p>
 </div></td>
 <td><div class="ansible-option-cell"><p>Package dependencies to install</p>
-<p class="ansible-option-line"><strong class="ansible-option-default-bold">Default:</strong> <code class="ansible-option-default docutils literal notranslate"><span class="pre">&quot;{%</span> <span class="pre">if</span> <span class="pre">(ansible_facts['pkg_mgr']</span> <span class="pre">==</span> <span class="pre">'apt')</span> <span class="pre">%}{{</span> <span class="pre">('python-apt'</span> <span class="pre">if</span> <span class="pre">ansible_facts['python_version']</span> <span class="pre">is</span> <span class="pre">version('3',</span> <span class="pre">'&lt;')</span> <span class="pre">else</span> <span class="pre">'python3-apt')</span> <span class="pre">}}</span> <span class="pre">{%</span> <span class="pre">else</span> <span class="pre">%}{%</span> <span class="pre">endif</span> <span class="pre">%}&quot;</span></code></p>
+<p class="ansible-option-line"><strong class="ansible-option-default-bold">Default:</strong> <code class="ansible-option-default docutils literal notranslate"><span class="pre">&quot;{{</span> <span class="pre">['python-apt']</span> <span class="pre">if</span> <span class="pre">ansible_facts['pkg_mgr']</span> <span class="pre">==</span> <span class="pre">'apt'</span> <span class="pre">and</span> <span class="pre">ansible_facts['python_version']</span> <span class="pre">is</span> <span class="pre">version('3',</span> <span class="pre">'&lt;')\n</span>&#160;&#160; <span class="pre">else</span> <span class="pre">['python3-apt']</span> <span class="pre">if</span> <span class="pre">ansible_facts['pkg_mgr']</span> <span class="pre">==</span> <span class="pre">'apt'\n</span>&#160;&#160; <span class="pre">else</span> <span class="pre">[]</span> <span class="pre">}}&quot;</span></code></p>
 </div></td>
 </tr>
 <tr class="row-odd"><td><div class="ansible-option-cell">

[klausi]

Thanks, works for me! I directly patched this into the installed prometheus role:

cd /path/to/galaxy/ansible_collections/prometheus/prometheus
wget https://patch-diff.githubusercontent.com/raw/prometheus-community/ansible/pull/668.diff
patch -p1 < 668.diff