Rationale:

 - Right now:

   - These pages' Markdown will be rendered when browsing our
     repository in the GitLab web interface

   - The .md extension is more common nowadays: GitHub, GitLab, and various
     other major players have settled on it. Let's get used to it.

 - If we decide to migrate our blueprints to GitLab (#18079),
   this will be a necessary first step.

metrics.md

+[[!meta title="Metrics"]]
+
+## Current status
+
+- Metrics are collected:
+  - Manually
+  - Only by sajolida and intrigeri
+  - Into text files
+  - In the internal Git repo
+
+- We are collecting:
+  - Community metrics
+    - Subscribers to amnesia-news
+    - Messages on tails-dev
+    - Subscribers on tails-dev
+    - Twitter followers
+  - Help desk
+    - Messages on tails-bug
+    - WhisperBack reports
+  - Releases
+    - Date
+    - Size
+  - Usage
+    - Boots
+    - Downloads of the OpenPGP signature
+
+## Concerns
+
+- The workload is not shared
+- The data is not systematically published (some are in the monthly reports)
+- Manual process
+
+## Taking a step back...
+
+- Why are we collecting these metrics?
+- What shall we do with them?
+- What metrics are most important to collect?
+- What kind of tools and infrastructure shall we use to manage these metrics?
+- Where do we store them? Who has access to them?
+
+## Ideas of abstract goals behind the numbers
+
+From a brainstorming session, with no priorities or check on whether
+these are possible and worth it to gather.
+
+- Find how many users we do have? What are the trends?
+- How many bugs? Per category? Are we carrying around old bugs? Are we adding new bugs?
+- Are we reducing errors for users ?
+- Are we reducing the time needed for task completion?
+- Help desk reports
+- How technically skilled do you need to be to use Tails? How technically skilled are our users?
+- Donations
+  - How many donations do we get?
+  - How much are people donation?
+  - When do we get donation?
+- Incoming links? Who is endorsing Tails?
+- Where are the users located?
+- How big, diverse and active is our community?
+- Statistics on private and public meetings:
+  - How many people attended?
+  - How many meetings?
+  - How many newcomers?
+- Conferences
+  - Attended?
+  - How many mentions?
+- How fast to we solve problems?
+  - Security issues
+- How organized and accountable we are?
+- Conversion rate
+  - User agents
+- Heat map of the website usage
+  - Are people coming to download the image?
+  - Are people coming to read the documentation?
+- Why are people interested in Tails?
+
+## Possible ways to gather this data
+
+- Ticket tracker for help desk
+- Web analytic
+- Surveys
+
+## References
+
+- [The definition of vanity metrics and how to identify them](https://www.tableau.com/learn/articles/vanity-metrics)
+- [Translating UX Goals into Analytics Measurement Plans](https://www.nngroup.com/articles/ux-goals-analytics/)