Upstream client may have resource issues

[willscott]

capturing from #30

bifrost-bank1-ny:/data# curl http://127.0.0.1:8080/ipfs/bafybeigdyrzt5sfp7udm7hu76uh7y26nf3efuylqabf3oclgtqy55fbzdi > /dev/null
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  116k  100  116k    0     0  1228k      0 --:--:-- --:--:-- --:--:-- 1231k

runs for a few minutes, but then entire binary dies around ~4k requests:

bifrost-bank1-ny:/data# curl http://127.0.0.1:8041/debug/metrics/prometheus -s | grep caboose_fetch_err
# HELP ipfs_caboose_fetch_errors Errors fetching from Caboose Peers
# TYPE ipfs_caboose_fetch_errors counter
ipfs_caboose_fetch_errors{code="0"} 3563
ipfs_caboose_fetch_errors{code="200"} 369

bifrost-bank1-ny:/data# curl http://127.0.0.1:8080/ipfs/bafybeigdyrzt5sfp7udm7hu76uh7y26nf3efuylqabf3oclgtqy55fbzdi > /dev/null
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (56) Recv failure: Connection reset by peer

[willscott]

fixed with #19