Created routes

app/controllers/metrics_controller.rb

@@ -0,0 +1,26 @@
+class MetricsController < ActionController::API
+
+  # GET /metric
+  def index 
+    render json: {}
+  end
+
+  # POST /metric/:key
+  def create
+    key = params[:key]
+    render json: {}
+  end
+
+  # GET /metric/:key
+  def show
+    # Return an empty JSON response
+    render json: {}
+  end
+
+  # DELETE /metric/:key
+  def delete
+    key = params[:key]
+    render json: {}
+  end
+
+end

config/routes.rb

@@ -1,6 +1,9 @@
 Rails.application.routes.draw do
   # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
-
+  get '/metric/', to: 'metrics#index'
+  post '/metric/:key', to: 'metrics#create'
+  get '/metric/:key', to: 'metrics#show'
+  delete '/metric/:key', to: 'metrics#delete'
   # Defines the root path route ("/")
   # root "articles#index"
 end