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+# Requirements for availability monitoring
+
+  - System requirements
+    - Runs on a modern linux distro
+    - System can send email
+    - System can run sigsum-debug binary
+    - Root access is not required
+  - Leveled alerts, aka severity
+    - Error
+    - Warning
+  - Alerts via email
+  - Check endpoint reachability
+    - API §3.1 - §3.7
+    - Enumerate the different ways to use an endpoint
+      - http, https
+      - ipv4, ipv6
+      - onion
+- Verify response data (the output of Sigsum endpoints)
+  - E.g., timestamp or number of witness signatures on get-tree-head-to-cosign
+- Perform checks from multiple vantage points
+
+# Concrete milestones
+
+220515
+
+  - Sigsum endpoints
+    - Either IPv4 or IPv6 (whatever the system's curl uses)
+    - Only HTTPS
+    - When do they 2XX?
+  - No alert state
+    - One alert per failure
+    - Configurable test frequency (~1h hour)
+  - Notifications by email only to one single address
+  - "Be done very quickly but also very imperfectly"
+
+220530
+220831
+221031