adaptive concurrency: Increase minRTT measurement pinned concurrency (#9007)

Signed-off-by: Tony Allen <tony@allen.gg>

Mirrored from https://github.com/envoyproxy/envoy @ 74fbb938dab53ebf782348371091ab49ffe039f6

envoy/config/filter/http/adaptive_concurrency/v2alpha/adaptive_concurrency.proto

@@ -57,6 +57,9 @@ message GradientControllerConfig {
     // Example: If the interval is 10s and the jitter is 15%, the next window will begin
     // somewhere in the range (10s - 11.5s).
     type.Percent jitter = 3;
+
+    // The concurrency limit set while measuring the minRTT. Defaults to 3.
+    google.protobuf.UInt32Value min_concurrency = 4 [(validate.rules).uint32 = {gt: 0}];
   }
 
   // The percentile to use when summarizing aggregated samples. Defaults to p50.

envoy/config/filter/http/adaptive_concurrency/v3alpha/adaptive_concurrency.proto

@@ -57,6 +57,9 @@ message GradientControllerConfig {
     // Example: If the interval is 10s and the jitter is 15%, the next window will begin
     // somewhere in the range (10s - 11.5s).
     type.v3alpha.Percent jitter = 3;
+
+    // The concurrency limit set while measuring the minRTT. Defaults to 3.
+    google.protobuf.UInt32Value min_concurrency = 4 [(validate.rules).uint32 = {gt: 0}];
   }
 
   // The percentile to use when summarizing aggregated samples. Defaults to p50.