Add Knative metrics to Prometheus

app/assets/javascripts/serverless/components/area.vue

...ts/javascripts/serverless/components/function_details.vue

...assets/javascripts/serverless/components/function_row.vue

app/assets/javascripts/serverless/components/functions.vue

.../javascripts/serverless/components/missing_prometheus.vue

app/assets/javascripts/serverless/constants.js

app/assets/javascripts/serverless/serverless_bundle.js

.../javascripts/serverless/services/get_functions_service.js

app/assets/javascripts/serverless/store/actions.js

app/assets/javascripts/serverless/store/getters.js

app/assets/javascripts/serverless/store/index.js

app/assets/javascripts/serverless/store/mutation_types.js

app/assets/javascripts/serverless/store/mutations.js

app/assets/javascripts/serverless/store/state.js

...javascripts/serverless/stores/serverless_details_store.js

app/assets/javascripts/serverless/stores/serverless_store.js

app/assets/javascripts/serverless/utils.js

app/controllers/projects/serverless/functions_controller.rb

app/finders/projects/serverless/functions_finder.rb

app/models/serverless/function.rb