address review: move config into chart configmap

Signed-off-by: Alok Behera <alokbeherak061@gmail.com>

Author: sudoalok

config/charts/routerlib/templates/_config.yaml

@@ -80,6 +80,35 @@ data:
       parser:
         pluginRef: {{ $parserType }}
     {{- end }}
+  passthrough-plugins.yaml: |
+    # Request-format agnostic routing. Use this when the request format is
+    # unknown or unsupported, so the EPP cannot rely on scorers that read the
+    # request body (e.g. the prefix-cache scorer). The passthrough parser does
+    # not parse the body, and routing falls back to backend-state scorers:
+    #   - active-request-scorer  : prefers the least busy endpoint
+    #   - session-affinity-scorer: keeps a session pinned to the same endpoint
+    # Select it by setting router.epp.pluginsConfigFile: passthrough-plugins.yaml
+    apiVersion: llm-d.ai/v1alpha1
+    kind: EndpointPickerConfig
+    plugins:
+    - type: passthrough-parser
+    - type: active-request-scorer
+    - type: session-affinity-scorer
+    - type: decode-filter
+    - type: max-score-picker
+    - type: single-profile-handler
+    requestHandler:
+      parsers:
+      - pluginRef: passthrough-parser
+    schedulingProfiles:
+    - name: default
+      plugins:
+      - pluginRef: decode-filter
+      - pluginRef: max-score-picker
+      - pluginRef: active-request-scorer
+        weight: 1
+      - pluginRef: session-affinity-scorer
+        weight: 1
   {{- if .Values.router.epp.pluginsCustomConfig }}
   {{- .Values.router.epp.pluginsCustomConfig | toYaml | nindent 2 }}
   {{- end }}