added logging documentation from Strapi v1

mkdocs.yml

@@ -40,6 +40,7 @@ pages:
     - Response: ./documentation/architecture/response.md
     - Databases: ./documentation/architecture/databases.md
     - Views: ./documentation/architecture/views.md
+    - Logging: ./documentation/architecture/logging.md
   - Concepts:
     - Authentication: ./documentation/concepts/authentication.md
     - GraphQL: ./documentation/concepts/graphql.md

website/documentation/architecture/logging.md

@@ -0,0 +1,95 @@
+# Logging
+
+Strapi comes with a simple and useful built-in logger.
+Its usage is purposely very similar to `console.log()`, but with a handful of
+extra features; namely support for multiple log levels with colorized,
+prefixed console output.
+
+The logger is accessible through the `strapi` object directly with `strapi.log`.
+
+You can work with this logger in the same way that you work with the default logger:
+
+```js
+strapi.log.info('Logs work!');
+```
+
+## Logging with Metadata
+
+In addition to logging string messages, the logger will also optionally log additional
+JSON metadata objects. Adding metadata is simple:
+
+```js
+strapi.log.info('Test log message', {
+  anything: 'This is metadata'
+});
+```
+
+## String interpolation
+
+The log method provides the same string interpolation methods like `util.format`.
+
+This allows for the following log messages.
+
+```js
+strapi.log.info('test message %s', 'my string');
+// => info: test message my string
+```
+
+```js
+strapi.log.info('test message %d', 123);
+// => info: test message 123
+```
+
+```js
+strapi.log.info('test message %j', {
+  number: 123
+}, {});
+// => info: test message {"number":123}
+// => meta = {}
+```
+
+```js
+strapi.log.info('test message %s, %s', 'first', 'second', {
+  number: 123
+});
+// => info: test message first, second
+// => meta = {number: 123}
+```
+
+```js
+strapi.log.info('test message', 'first', 'second', {
+  number: 123
+});
+// => info: test message first second
+// => meta = {number: 123}
+```
+
+```js
+strapi.log.info('test message %s, %s', 'first', 'second', {
+  number: 123
+}, function() {});
+// => info: test message first, second
+// => meta = {number: 123}
+// => callback = function() {}
+```
+
+```js
+strapi.log.info('test message', 'first', 'second', {
+  number: 123
+}, function() {});
+// => info: test message first second
+// => meta = {number: 123}
+// => callback = function() {}
+```
+
+## Logging levels
+
+Setting the level for your logging message can be accomplished by using
+the level specified methods defined.
+
+```js
+strapi.log.debug('This is a debug log');
+strapi.log.info('This is an info log');
+strapi.log.warn('This is a warning log');
+strapi.log.error('This is an error log ');
+```