Feature Description (功能描述)

as you know slow query log is important for db,like mysql.

record query time, when using api to query graph info,because i think the api total time is the real query time for user.

some questions maybe need discuss @javeme @JackyYangPassion @imbajin @liuxiaocs7 @Radeity @simon824 @z7658329 @VGalaxies

1. do we need store slow log to file or just print it ? just use slf4j Logger？
2. hg support gremlin api & params api such as EdgeAPI/VertexAPI, they are different, do we need transform it when we record it( gremlin query language and params are different)?
3. i think we need set time threold、enabled、file path？like neo4j：

threold：

enable：