Note that v1.6.0 has a hardfork, which will be activated at block height 13,979,161 (ETA is 10/28/2021 around 11pm UTC) on IoTeX mainnet.
- Added API tracing functionality, which enables measuring and visualizing the break-down of API call timing. We'll work on API performance improvement based on the observability this tool provides in future releases
- Exposed gRPC health check point in the API server
- Fixed contract read issue for certain smart contracts we've seen earlier
- ioctl tool can export private key from HDWallet now