ezelkow1 opened a new pull request #6708:
URL: https://github.com/apache/trafficserver/pull/6708


   This adds 3 new log fields for transaction output (since collapsed 
forwarding is transaction based)
   * crra - The number of read retry attempts for this transaction. If no CF 
has been done (it has not attempted a write) then this is just the read lock 
contention.  If a write has been attempted then this value gets reset to 0 as 
it attempts more reads post-write-fail.
   * cwra - The number of write retry attempts. This will be either the number 
based on write lock contention, or it can be the max-write-retries+1. If it is 
max+1 that means that we have hit the max attempts because the lock was being 
held by another writer and so this transaction fell back to read retries and 
attempted to be collapsed
   * cccs - Collapsed connection success. This is just 0/1. 0 if a connection 
either was not attempted to be collapsed, did not need to be collapsed, or it 
was attempted but ended up going to the origin anyway.  If it is 1 then this 
transaction hit its max write retries but successfully got a cache HIT during 
its read retries post-write-failure


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