Added metric-shipping to monitor boot-time

no issue
Boot-time metrics are really valuable for understanding how releases affect the performance of Ghost. The new @tryghost/metrics package lets us ship these metrics to different sources using the same configuration framework as @tryghost/logging introduced.

core/boot.js

@@ -16,14 +16,19 @@ const debug = require('@tryghost/debug')('boot');
  * Helper class to create consistent log messages
  */
 class BootLogger {
-    constructor(logging, startTime) {
+    constructor(logging, metrics, startTime) {
         this.logging = logging;
+        this.metrics = metrics;
         this.startTime = startTime;
     }
     log(message) {
         let {logging, startTime} = this;
         logging.info(`Ghost ${message} in ${(Date.now() - startTime) / 1000}s`);
     }
+    metric(name) {
+        let {metrics, startTime} = this;
+        metrics.metric(name, Date.now() - startTime);
+    }
 }
 
 /**
@@ -289,6 +294,7 @@ async function bootGhost() {
     let config;
     let ghostServer;
     let logging;
+    let metrics;
 
     // These require their own try-catch block and error format, because we can't log an error if logging isn't working
     try {
@@ -301,7 +307,8 @@ async function bootGhost() {
         // Logging is used absolutely everywhere
         debug('Begin: Load logging');
         logging = require('@tryghost/logging');
-        bootLogger = new BootLogger(logging, startTime);
+        metrics = require('@tryghost/metrics');
+        bootLogger = new BootLogger(logging, metrics, startTime);
         debug('End: Load logging');
 
         // At this point logging is required, so we can handle errors better
@@ -362,6 +369,7 @@ async function bootGhost() {
 
         // Step 6 - We are technically done here - let everyone know!
         bootLogger.log('booted');
+        bootLogger.metric('boot-time');
         notifyServerReady();
 
         // Step 7 - Init our background services, we don't wait for this to finish

loggingrc.js

@@ -8,6 +8,14 @@ module.exports = {
     mode: config.get('logging:mode'),
     level: config.get('logging:level'),
     transports: config.get('logging:transports'),
+    metrics: {
+        transports: config.get('logging:metrics:transports'),
+        metadata: {
+            // Undefined if unavailable
+            siteId: config.get('hostSettings:siteId'),
+            domain: config.get('url')
+        }
+    },
     gelf: config.get('logging:gelf'),
     loggly: config.get('logging:loggly'),
     elasticsearch: config.get('logging:elasticsearch'),

package.json

@@ -84,6 +84,7 @@
     "@tryghost/members-importer": "0.3.3",
     "@tryghost/members-offers": "0.4.2",
     "@tryghost/members-ssr": "1.0.14",
+    "@tryghost/metrics": "0.2.0",
     "@tryghost/mw-session-from-token": "0.1.25",
     "@tryghost/nodemailer": "0.3.3",
     "@tryghost/package-json": "1.0.5",

yarn.lock

@@ -1563,6 +1563,13 @@
     leaky-bucket "^2.2.0"
     stripe "^8.174.0"
 
+"@tryghost/metrics@0.2.0":
+  version "0.2.0"
+  resolved "https://registry.yarnpkg.com/@tryghost/metrics/-/metrics-0.2.0.tgz#e44ddea0ffc6b4092a7dd83f12911f4e3d00812c"
+  integrity sha512-pym7A2BDjVCNj6LPlxPg5qPXbrZNSamXWqTF5PxeUSUhF6kZpYkxSVU1L3ADkQlG1UqYsJQuO4FrEf0DBuntJg==
+  dependencies:
+    "@tryghost/pretty-stream" "^0.1.1"
+
 "@tryghost/mobiledoc-kit@^0.12.4-ghost.1":
   version "0.12.4-ghost.1"
   resolved "https://registry.yarnpkg.com/@tryghost/mobiledoc-kit/-/mobiledoc-kit-0.12.4-ghost.1.tgz#32060242b4c7e787a9605ba856454c6a26141925"
@@ -1606,6 +1613,15 @@
     chalk "^4.1.0"
     sywac "^1.3.0"
 
+"@tryghost/pretty-stream@^0.1.1":
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/@tryghost/pretty-stream/-/pretty-stream-0.1.1.tgz#8be18694f3081424c0efb832fa32469d5891356b"
+  integrity sha512-+FYAVozEmYctaVI+4xEhRnpep0xSnGL7FiT91dffxTLx2QVQxI1qADD9Dfb9EzIYIDRttUKoZJ4xzrVpnzD0WQ==
+  dependencies:
+    lodash "^4.17.21"
+    moment "^2.29.1"
+    prettyjson "^1.2.1"
+
 "@tryghost/promise@0.1.12":
   version "0.1.12"
   resolved "https://registry.yarnpkg.com/@tryghost/promise/-/promise-0.1.12.tgz#05fc3acba1c74a02255c11fcee5383e291d6f25f"