AbsInt return abs(int).

LoadTagReplaceEnv replace `{env}` to env "spring.{env}" -> "spring.sit".

LoadTagsAppendEnv append env to tags slice []string{"spring"} -> []string{"spring.sit"}.

LoadTagsMapAppendEnv append env to tags map map[string]interface{}{"spring": "xxx"} -> map[string]interface{}{"spring.sit": "xxx"}.

LoadTagsReplaceEnv replace `{env}` to env []string{"spring.{env}"} -> []string{"spring.sit"}.

TemplateWithMap replace `${var}` in template string.

TemplateWithMapAndRegexp replace `${var}` in template string.

FluentMsg is the structure of fluent message.