Configured New Relic integration within Ghost core

refs https://github.com/TryGhost/DevOps/issues/66

- this allows us to enable New Relic within Ghost by providing some sane
  defaults

ghost/core/core/boot.js

@@ -474,6 +474,14 @@ async function bootGhost({backend = true, frontend = true, server = true} = {})
 
     try {
         // Step 1 - require more fundamental components
+
+        // Load New Relic
+        debug('Begin: Load New Relic');
+        if (config.get('newRelic:enabled')) {
+            require('newrelic');
+        }
+        debug('End: Load New Relic');
+
         // Sentry must be initialized early, but requires config
         debug('Begin: Load sentry');
         require('./shared/sentry');

ghost/core/newrelic.js

@@ -0,0 +1,53 @@
+const config = require('./core/shared/config');
+
+exports.config = {
+    app_name: ['Ghost'],
+    license_key: config.get('newRelic:licenseKey'),
+    labels: {
+        env: process.env.PRO_ENV || 'unknown',
+        site: config.get('hostSettings:siteId')
+    },
+    // Agent only imported when enabled, but this will further cement that
+    agent_enabled: config.get('newRelic:enabled'),
+    distributed_tracing: {
+        enabled: true
+    },
+    logging: {
+        level: 'info'
+    },
+    slow_sql: {
+        // Default is false.
+        enabled: true,
+        // Default is 10. Increasing this limit increases memory usage
+        // Defines the maximum number of slow queries the agent collects per minute.
+        // The agent discards additional queries after the limit is reached.
+        max_samples: 10
+    },
+    error_collector: {
+        ignore_classes: [
+            // @NOTE: add more error classes to ignore here
+            'ValidationError',
+            'NoPermissionError'
+        ]
+    },
+    transaction_tracer: {
+        enabled: true,
+        record_sql: 'obfuscated'
+    },
+    allow_all_headers: true,
+    attributes: {
+        exclude: [
+            // Default exclusions (TODO: add more!):
+            'request.headers.cookie',
+            'request.headers.authorization',
+            'request.headers.proxyAuthorization',
+            'request.headers.setCookie*',
+            'request.headers.x*',
+            'response.headers.cookie',
+            'response.headers.authorization',
+            'response.headers.proxyAuthorization',
+            'response.headers.setCookie*',
+            'response.headers.x*'
+        ]
+    }
+};

ghost/core/package.json

@@ -209,6 +209,7 @@
     "multer": "1.4.4",
     "mysql2": "3.5.2",
     "nconf": "0.12.0",
+    "newrelic": "11.0.0",
     "node-jose": "2.2.0",
     "path-match": "1.2.4",
     "probe-image-size": "7.2.3",