this email list is about cloud foundry oss, not pivotal commercial
software. you can always open a support case at pivotal.io/support for
commercial product inquiries.

the pcf mysql product is based on the oss cf mysql [1]. for each bosh
deployment of mysql you get a mysql compatible cluster. the cluster uses
mariadb and galera for the database nodes. the default configurations for
tunable parameters are listed in the spec file:
https://github.com/cloudfoundry/cf-mysql-release/blob/master/jobs/mysql/spec

what those values should be for your deployment and application workloads
are going to be highly dependent on what tradeoffs you want to make. the
service plan you use should indicate the number of connections available
with your plan, and how you configure max connections in your application
typically depends on the database access framework you use.

[1] github.com/cloudfoundry/cf-mysql-release

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Thank you,

James Bayer