Increase max pending sources per source origin #1107
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From UMA metrics, we identified that a higher than expected number of sources were being dropped due to the limit of 1024 sources per source origin, specifically ~6% are being dropped due to it.
This was also reported in #1103
A first step toward mitigating this issue is to increase the limit from 1024 to 4096. Analyses were conducted to confirm that no problematic increase in storage usage is expected from this change.