FreeBug

[BUG] App name in metric is unknown_ go_ service

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## Issue Description Type: *bug report* ### Describe what happened https://github.com/alibaba/sentinel-golang/blob/683c229b23a96c4ad07dc795da3730db8fd9d93c/exporter/metric/exporter.go#L35-L45 Since the above code (code 1) uses the `init` function and is executed before the following code (code 2),...

Fix app name in metric is unknown_go_service (#453)

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### Describe what this PR does / why we need it ### Does this pull request fix one issue? Fixes #453 ### Describe how you did it ### Describe how...

Error: Callback was already called.

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$ node index.js "swagger.json" [ 'swagger.json' ] one done /home/XXX/Workspaces/open/swagger-to-PDF/node_modules/phantomjs-pdf/node_modules/async/dist/async.js:844 if (fn === null) throw new Error("Callback was already called."); ^ Error: Callback was already called. at /home/XXX/Workspaces/open/swagger-to-PDF/node_modules/phantomjs-pdf/node_modules/async/dist/async.js:844:36 at /home/XXX/Workspaces/open/swagger-to-PDF/node_modules/phantomjs-pdf/node_modules/async/dist/async.js:3676:17...

### Information is as follows： Parameters： | Name | In | Description | Required | Type Format | Collection Format | Default | Min | Max | | --- |...