compat prometheus

changelog/unreleased/kong/fix-ai-metrics-prometheus-compat.yml

@@ -0,0 +1,4 @@
+message: >
+  "**Prometheus**: Add compatibility for the new configuration field `ai-metrics`.
+type: feature
+scope: Plugin

kong/clustering/compat/checkers.lua

@@ -37,6 +37,18 @@ local compatible_checkers = {
               dp_version, log_suffix)
           end
         end
+
+        if plugin.name == 'prometheus' then
+          local config = plugin.config
+          if config.ai_metrics ~= nil then
+            config.ai_metrics = nil
+            has_update = true"
+            log_warn_message('configures ' .. plugin.name .. ' plugin with ai_metrics',
+                             'will be removed.',
+                             dp_version, log_suffix)
+            has_update = true
+          end
+        end
       end
 
       return has_update

spec/02-integration/09-hybrid_mode/09-config-compat_spec.lua

@@ -635,6 +635,28 @@ describe("CP/DP config compat transformations #" .. strategy, function()
       end)
     end)
 
+    describe("prometheus plugins", function()
+      it("[prometheus] remove ai_metrics property for versions below 3.8", function()
+        -- [[ 3.7.x ]] --
+        local prometheus = admin.plugins:insert {
+          name = "prometheus",
+          enabled = true,
+          config = {
+            ai_metrics = true, -- becomes nil
+          },
+        }
+        -- ]]
+
+        local expected_prometheus_prior_38 = cycle_aware_deep_copy(prometheus)
+        expected_prometheus_prior_38.config.ai_metrics = nil
+
+        do_assert(uuid(), "3.7.0", expected_prometheus_prior_38)
+
+        -- cleanup
+        admin.plugins:remove({ id = prometheus.id })
+      end)
+    end)
+
     describe("www-authenticate header in plugins (realm config)", function()
       it("[basic-auth] removes realm for versions below 3.6", function()
         local basic_auth = admin.plugins:insert {