chore: tier3 marker

Author: fege

pytest.ini

@@ -10,10 +10,11 @@ markers =
     parallel: marks tests that can run in parallel along with pytest-xdist
 
     # CI
-    smoke: Mark tests as smoke tests; covers core functionality of the product. Aims to ensure that the build is stable enough for further testing.
+    smoke: Mark tests as smoke tests; very high critical priority tests. Covers core functionality of the product. Aims to ensure that the build is stable enough for further testing.
     sanity: Mark tests as sanity tests. Aims to verify that specific functionality is working as expected.
-    tier1: Mark tests as tier1. Aims to cover frequently used functionality of the product and basic user flows.
-    tier2: Mark tests as tier2. Aims to cover more advanced functionality of the product.
+    tier1: Mark tests as tier1. High-priority tests.
+    tier2: Mark tests as tier2. Medium/low-priority positive tests.
+    tier3: Mark tests as tier3. Negative and destructive tests.
     slow: Mark tests which take more than 10 minutes as slow tests.
     pre_upgrade: Mark tests which should be run before upgrading the product.
     post_upgrade: Mark tests which should be run after upgrading the product.