Add rake task for usage ping generation

  - Add rake task to generate and print usage ping
  JSON
  - Add rake task to generate and send usage ping
  to Versions Application
  - Add docs

doc/administration/troubleshooting/gitlab_rails_cheat_sheet.md

@@ -1016,6 +1016,22 @@ This will also refresh the cached usage ping displayed in the admin area
 Gitlab::UsageData.to_json(force_refresh: true)
 ```
 
+#### Generate and print
+
+Generates usage ping data in JSON format.
+
+```shell
+rake gitlab:usage_data:generate
+```
+
+#### Generate and send usage ping
+
+Prints the metrics saved in `conversational_development_index_metrics`.
+
+```shell
+rake gitlab:usage_data:generate_and_send
+```
+
 ## Elasticsearch
 
 ### Configuration attributes

lib/tasks/gitlab/usage_data.rake

@@ -9,5 +9,16 @@ namespace :gitlab do
     task dump_sql_in_json: :environment do
       puts Gitlab::Json.pretty_generate(Gitlab::UsageDataQueries.uncached_data)
     end
+
+    desc 'GitLab | UsageData | Generate usage ping in JSON'
+    task generate: :environment do
+      puts Gitlab::UsageData.to_json(force_refresh: true)
+    end
+
+    desc 'GitLab | UsageData | Generate usage ping and send it to Versions Application'
+    task generate_and_send: :environment do
+      result = SubmitUsagePingService.new.execute
+      puts result.inspect
+    end
   end
 end