THREESCALE-15547 fix(3scale_batcher): handle string values

[tkan145]

What

Fix https://redhat.atlassian.net/browse/THREESCALE-15547

Verification steps

• Checkout this branch
• Build new runtime-image

make runtime-image IMAGE_NAME=apicast-test

• Get into dev-env

cd dev-environments/plain-http-upstream

• Edit apicast-config.json as follow

diff --git a/dev-environments/plain-http-upstream/apicast-config.json b/dev-environments/plain-http-upstream/apicast-config.json
index ff944273..4ff9bf1d 100644
--- a/dev-environments/plain-http-upstream/apicast-config.json
+++ b/dev-environments/plain-http-upstream/apicast-config.json
@@ -13,6 +13,14 @@
         "policy_chain": [
           {
             "name": "apicast.policy.apicast"
+          },
+          {
+              "name": "3scale_batcher",
+              "version": "builtin",
+              "configuration": {
+                  "auths_ttl": "2",
+                  "batch_report_seconds": "10"
+              }
           }
         ],
         "proxy_rules": [

• Start the gateway

make gateway IMAGE_NAME=apicast-test

• Send a request to the gateway

curl --resolve get.example.com:8080:127.0.0.1 -v "http://get.example.com:8080/?user_key=123"

• You should get a HTTP/1.1 200 response
• Monitor the gateway log, you should see the following

gateway-1  | 2026/07/22 04:19:28 [debug] 19#19: *38 3scale_batcher.lua:69: func(): 3scale batcher report timer got 1 reports