API: remove configuration of Entrypoint and Middlewares

Co-authored-by: Julien Salleyron <julien.salleyron@gmail.com>

docs/content/observability/metrics/prometheus.md

@@ -44,54 +44,6 @@ metrics:
 --metrics.prometheus.buckets=0.100000, 0.300000, 1.200000, 5.000000
 ```
 
-#### `entryPoint`
-
-_Optional, Default=traefik_
-
-Entry-point used by prometheus to expose metrics.
-
-```toml tab="File (TOML)"
-[metrics]
-  [metrics.prometheus]
-    entryPoint = traefik
-```
-
-```yaml tab="File (TOML)"
-metrics:
-  prometheus:
-    entryPoint: traefik
-```
-
-```bash tab="CLI"
---metrics
---metrics.prometheus.entryPoint=traefik
-```
-
-#### `middlewares`
-
-_Optional, Default=""_
-
-Middlewares.
-
-```toml tab="File (TOML)"
-[metrics]
-  [metrics.prometheus]
-    middlewares = ["xxx", "yyy"]
-```
-
-```yaml tab="File (TOML)"
-metrics:
-  prometheus:
-    middlewares:
-    - xxx
-    - yyy
-```
-
-```bash tab="CLI"
---metrics
---metrics.prometheus.middlewares="xxx,yyy"
-```
-
 #### `addEntryPointsLabels`
 
 _Optional, Default=true_