feat: Add grpc timeouts annotations (#11258)

* ✨ feat: add grpc timeouts with proxy settings if backend is grpc

* 📝  docs: Documentation only changes

* 🐛 fix: uppercase for protocol

* 📝 docs: grpc timeouts example

* 📝 docs: add links and default values for proxy timeout

* 🧪 test: add e2e test for timeout

* 🐛 fix: upgrade to 1.0.6 to fix nil pointer

* 🐛 fix: lint

* 🧪 test: trigger ci

docs/user-guide/nginx-configuration/annotations.md

@@ -698,6 +698,12 @@ In some scenarios is required to have different values. To allow this we provide
 - `nginx.ingress.kubernetes.io/proxy-next-upstream-tries`
 - `nginx.ingress.kubernetes.io/proxy-request-buffering`
 
+If you indicate [Backend Protocol](#backend-protocol) as `GRPC` or `GRPCS`, the following grpc values will be set and inherited from proxy timeouts:
+
+- [`grpc_connect_timeout=5s`](https://nginx.org/en/docs/http/ngx_http_grpc_module.html#grpc_connect_timeout), from `nginx.ingress.kubernetes.io/proxy-connect-timeout`
+- [`grpc_send_timeout=60s`](https://nginx.org/en/docs/http/ngx_http_grpc_module.html#grpc_send_timeout), from `nginx.ingress.kubernetes.io/proxy-send-timeout`
+- [`grpc_read_timeout=60s`](https://nginx.org/en/docs/http/ngx_http_grpc_module.html#grpc_read_timeout), from `nginx.ingress.kubernetes.io/proxy-read-timeout`
+
 Note: All timeout values are unitless and in seconds e.g. `nginx.ingress.kubernetes.io/proxy-read-timeout: "120"` sets a valid 120 seconds proxy read timeout.
 
 ### Proxy redirect

docs/user-guide/nginx-configuration/configmap.md

@@ -1101,14 +1101,20 @@ See NGINX [client_max_body_size](https://nginx.org/en/docs/http/ngx_http_core_mo
 
 Sets the timeout for [establishing a connection with a proxied server](https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_connect_timeout). It should be noted that this timeout cannot usually exceed 75 seconds.
 
+It will also set the [grpc_connect_timeout](https://nginx.org/en/docs/http/ngx_http_grpc_module.html#grpc_connect_timeout) for gRPC connections.
+
 ## proxy-read-timeout
 
 Sets the timeout in seconds for [reading a response from the proxied server](https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_read_timeout). The timeout is set only between two successive read operations, not for the transmission of the whole response.
 
+It will also set the [grpc_read_timeout](https://nginx.org/en/docs/http/ngx_http_grpc_module.html#grpc_read_timeout) for gRPC connections.
+
 ## proxy-send-timeout
 
 Sets the timeout in seconds for [transmitting a request to the proxied server](https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_send_timeout). The timeout is set only between two successive write operations, not for the transmission of the whole request.
 
+It will also set the [grpc_send_timeout](https://nginx.org/en/docs/http/ngx_http_grpc_module.html#grpc_send_timeout) for gRPC connections.
+
 ## proxy-buffers-number
 
 Sets the number of the buffer used for [reading the first part of the response](https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffers) received from the proxied server. This part usually contains a small response header.