Tenant Security Proxy v4.16.0 and Tenant Security Logdriver v4.4.0

[skeet70]

We've released Tenant Security Proxy v4.16.0 (https://ironcorelabs.com/docs/saas-shield/tenant-security-proxy/changelog/#v4160) and Tenant Security Logdriver v4.4.0 (https://ironcorelabs.com/docs/saas-shield/tenant-security-logdriver/changelog/#v440). They both share a change to logging format that includes more context about where the log message came from, along with full messages levels (instead of shortened), and a reduction in logging related memory usage.

The TSP was also changed to drop log events sent to Logdriver if both of its buffers are full (50000 messages) instead of waiting 25ms before dropping them. In practice during events where the buffers filled up, we were seeing the timeout slow down the TSP without a significant benefit in number of events successfully delivered.

The TSL had a significant upgrade in it's single-tenant throughput, from ~450 rps locked, to uncapped but still fair. On 6 cores we've been seeing 7000 rps single tenant perfomance through one TSP-TSL pair. Look out for upcoming documentation describing in better detail how to calculate how many TSLs to deploy for a given TSP's traffic, and better horizontal/vertical scaling information.