ListEvaluationHistory now enforces max page size. (#3873)

It is currently valued at the same as the default page size. We might
raise it once we have more details about the performance impact of the
endpoint.

internal/controlplane/handlers_evalstatus.go

@@ -37,6 +37,10 @@ import (
 
 const (
 	defaultPageSize uint64 = 25
+	// Maximum page size has a conservative value at the moment,
+	// we can raise it once we have more insight on its
+	// performance impact.
+	maxPageSize uint64 = 25
 )
 
 // ListEvaluationHistory lists current and past evaluation results for
@@ -63,6 +67,10 @@ func (s *Server) ListEvaluationHistory(
 		size = in.GetCursor().GetSize()
 	}
 
+	if size > maxPageSize {
+		return nil, status.Error(codes.InvalidArgument, "invalid cursor")
+	}
+
 	// process filter
 	opts := []history.FilterOpt{}
 	opts = append(opts, FilterOptsFromStrings(in.GetEntityType(), history.WithEntityType)...)