v1.8.0-rc3

What's Changed

• feat: timeout configurable by @simlecode in #268
• chore: format code by @simlecode in #270
• docs: add metric document by @simlecode in #269
• fix: fix memory leak by @simlecode in #272
• chore: bump to version v1.8.0-rc3 by @simlecode in #274

Full Changelog: v1.8.0-rc2...v1.8.0-rc3