Local Rule Import Error - threshold (in rule) is deprecated; use detection_filter instead. in rule

["Full Name" <subaru279 () excite com>]

Greetings, I'm having issues performing local rule imports on my FirePOWER devices. It doesn't seem to like the 
threshold filter and recommends me to use the detection_filter instead (See error below). Am I doing something wrong or 
is there a way to bypass or allow rule imports with the threshold filter?

Local Rule Import Error: "threshold (in rule) is deprecated; use detection_filter instead. in rule"  

Rule: alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET CURRENT_EVENTS Possible Discover Phishing Domain 
Feb 02 2017"; flow:to_server,established; content:"GET"; http_method; content:"discover.com"; http_header; 
fast_pattern; content:!"Referer|3a 20|"; http_header; content:!"discover.com|0d 0a|"; http_header; 
content:!"autodiscover"; http_header; pcre:"/^Host\x3a[^\r\n]+discover\.com[^\r\n]{20,}\r\n/Hmi"; threshold: type 
limit, count 1, track by_src, seconds 30; classtype:trojan-activity; sid:2023819; rev:2; metadata:affected_product 
Web_Browsers, attack_target Client_Endpoint, deployment Perimeter, tag Phishing, signature_severity Major, created_at 
2017_02_02, updated_at 2017_02_02;)

> From the research it seem Threshold filters are no longer supported. If so why is it still being utilized? Thanks
http://manual-snort-org.s3-website-us-east-1.amazonaws.com/node35.html

Regards,
Mike

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