LTSV support for decoding logs

[f1shl3gs]

LTSV -- Labeled Tab-separated Values format is a variant of Tab separated Values(TSV).

Apach and Nginx use this kind of format for access log

# Nginx
log_format ltsv "time:$time_local"
                "\thost:$remote_addr"
                "\tforwardedfor:$http_x_forwarded_for"
                "\treq:$request"
                "\tstatus:$status"
                "\tsize:$body_bytes_sent"
                "\treferer:$http_referer"
                "\tua:$http_user_agent"
                "\treqtime:$request_time"
                "\tcache:$upstream_http_x_cache"
                "\truntime:$upstream_http_x_runtime"
                "\tvhost:$host";

BTW:
If nginx produce json logs, then everything is simplier and efficient. e.g.

log_format json escape=json '{"@timestamp":"$time_iso8601",'
            '"@version":"1",'
            '"server_addr":"$server_addr",'
            '"remote_addr":"$remote_addr",'
            '"host":"$host",'
            '"uri":"$uri",'
            '"body_bytes_sent":$body_bytes_sent,'
            '"bytes_sent":$body_bytes_sent,'
            '"upstream_response_time":$upstream_response_timer,'
            '"request":"$request",'
            '"request_length":$request_length,'
            '"request_time":$request_time,'
            '"status":"$status",'
            '"http_referer":"$http_referer",'
            '"http_x_forwarded_for":"$http_x_forwarded_for",'
            '"http_user_agent":"$http_user_agent"'
            '}';