fix(opentelemetry): migration exception when upgrading from below ver…

…sion 3.3 to 3.7 (#13391)

changelog/unreleased/kong/fix-otel-migrations-exception.yml

@@ -0,0 +1,3 @@
+message: "**OpenTelemetry:** Fixed an issue where migration fails when upgrading from below version 3.3 to 3.7."
+type: bugfix
+scope: Plugin

kong/plugins/opentelemetry/migrations/001_331_to_332.lua

@@ -4,6 +4,10 @@ local operations = require "kong.db.migrations.operations.331_to_332"
 local function ws_migration_teardown(ops)
   return function(connector)
     return ops:fixup_plugin_config(connector, "opentelemetry", function(config)
+      if not config.queue then
+        return false
+      end
+
       if config.queue.max_batch_size == 1 then
         config.queue.max_batch_size = 200
         return true

spec/05-migration/plugins/opentelemetry/migrations/001_331_to_332_spec.lua

@@ -4,7 +4,56 @@ local uh = require "spec.upgrade_helpers"
 
 
 if uh.database_type() == 'postgres' then
-    local handler = uh.get_busted_handler("3.3.0", "3.6.0")
+    local handler = uh.get_busted_handler("3.0.0", "3.2.0")
+    handler("opentelemetry plugin migration", function()
+        lazy_setup(function()
+            assert(uh.start_kong())
+        end)
+
+        lazy_teardown(function ()
+            assert(uh.stop_kong())
+        end)
+
+        uh.setup(function ()
+            local admin_client = assert(uh.admin_client())
+
+            local res = assert(admin_client:send {
+                method = "POST",
+                path = "/plugins/",
+                body = {
+                    name = "opentelemetry",
+                    config = {
+                        endpoint = "http://localhost:8080/v1/traces",
+                    }
+                },
+                headers = {
+                    ["Content-Type"] = "application/json"
+                }
+            })
+            assert.res_status(201, res)
+            admin_client:close()
+        end)
+
+        uh.new_after_finish("has opentelemetry queue configuration", function ()
+            local admin_client = assert(uh.admin_client())
+            local res = assert(admin_client:send {
+                method = "GET",
+                path = "/plugins/"
+            })
+            local body = cjson.decode(assert.res_status(200, res))
+            assert.equal(1, #body.data)
+            assert.equal("opentelemetry", body.data[1].name)
+            local expected_config = {
+                queue = {
+                    max_batch_size = 200
+                },
+            }
+            assert.partial_match(expected_config, body.data[1].config)
+            admin_client:close()
+        end)
+    end)
+
+    handler = uh.get_busted_handler("3.3.0", "3.6.0")
     handler("opentelemetry plugin migration", function()
         lazy_setup(function()
             assert(uh.start_kong())