Stop logging "informational" rate limits

We are throttling at 180 reqs per minute, and log when an IP is throttled.

We also were monitoring a lower rate limit, to just log informationally. Especially as we were trying to get a sense of what was going on, that was maybe interesting.

But now that we've done it for a while, those voluminous logs aren't giving us much info, we aren't really using them. By no longer tracking them, we can increase our performance a bit (one less thing that's tracked on every request; less RAM in memcached to track it), and decrease our logging-and-alerting-stuff-we-don't-look-at.

Author: jrochkind

config/initializers/rack_attack.rb

@@ -29,8 +29,6 @@
 # But we're going to try a more generous 3 per second over
 # 1 minute instead.
 #
-# May 1 2024: Limiting much more extensively to 30 req per minute -- one per every two seconds
-# averaging over a minute -- after bot  attacks costing us money from s3.
 Rack::Attack.throttle('req/ip', limit: 180, period: 1.minutes) do |req|
   # On heroku, we may be delivering assets via rack, I think.
   # We also try to exempt our "api" responses from rate limit, although
@@ -44,12 +42,6 @@
                  )
 end
 
-# But we're also going to TRACK at half that limit, for ease
-# of understanding what's going on in our logs
-Rack::Attack.track("req/ip_track", limit: 90, period: 1.minute) do |req|
-  req.ip unless req.path.start_with?('/assets')
-end
-
 # And we want to log rack-attack track and throttle  notifications. But we get
 # a notification every time an IP has exceeded the limit -- that's far too
 # many to log every time, could be many per second when it's exceeding limits.
@@ -73,8 +65,8 @@
   rack_env     = rack_request.env
   match_name = rack_env["rack.attack.matched"]
 
-  # only log here for our `req/` throttles and tracks above, not our other ones such as bot detect
-  next unless match_name.start_with?("req/")
+  # only log here for our `req/` throttle  above, not our other ones such as bot detect
+  next unless match_name == "req/ip"
 
   match_data   = rack_env["rack.attack.match_data"]
   match_data_formatted = match_data.slice(:count, :limit, :period).map { |k, v| "#{k}=#{v}"}.join(" ")