github.com/hashicorp/consul

BACKWARDS INCOMPATIBILITIES:

• Added a new query ACL type to manage prepared query names, and stopped capturing ACL tokens by default when prepared queries are created. This won't affect existing queries and how they are executed, but this will affect how they are managed. Now management of prepared queries can be delegated within an organization. If you use prepared queries, you'll need to read the Consul 0.6.4 upgrade instructions before upgrading to this version of Consul. [GH-1748]
• Consul's Go API client now pools connections by default, and requires you to manually opt-out of this behavior. Previously, idle connections were supported and their lifetime was managed by a finalizer, but this wasn't reliable in certain situations. If you reuse an API client object during the lifetime of your application, then there's nothing to do. If you have short-lived API client objects, you may need to configure them using the new api.DefaultNonPooledConfig() method to avoid leaking idle connections. [GH-1825]
• Consul's Go API client's agent.UpdateTTL() function was updated in a way that will only work with Consul 0.6.4 and later. The agent.PassTTL(), agent.WarnTTL(), and agent.FailTTL() functions were not affected and will continue work with older versions of Consul. [GH-1794]

FEATURES:

• Added new template prepared queries which allow you to define a prefix (possibly even an empty prefix) to apply prepared query features like datacenter failover to multiple services with a single query definition. This makes it easy to apply a common policy to multiple services without having to manage many prepared queries. See Prepared Query Templates for more details. [GH-1764]
• Added a new ability to translate address lookups when doing queries of nodes in remote datacenters via DNS using a new translate_wan_addrs configuration option. This allows the node to be reached within its own datacenter using its local address, and reached from other datacenters using its WAN address, which is useful in hybrid setups with mixed networks. [GH-1698]

IMPROVEMENTS:

• Added a new disable_hostname configuration option to control whether Consul's runtime telemetry gets prepended with the host name. All of the telemetry configuration has also been moved to a telemetry nested structure, but the old format is currently still supported. [GH-1284]
• Consul's Go dependencies are now vendored using Godep. [GH-1714]
• Added support for EnableTagOverride for the catalog in the Go API client. [GH-1726]
• Consul now ships built from Go 1.6. [GH-1735]
• Added a new /v1/agent/check/update/<check id> API for updating TTL checks which makes it easier to send large check output as part of a PUT body and not a query parameter. [GH-1785].
• Added a default set of Accept headers for HTTP checks. [GH-1819]
• Added support for RHEL7/Systemd in Terraform example. [GH-1629]

BUG FIXES:

• Updated the internal web UI (-ui option) to latest released build, fixing an ACL-related issue and the broken settings icon. [GH-1619]
• Fixed an issue where blocking KV reads could miss updates and return stale data when another key whose name is a prefix of the watched key was updated. [GH-1632]
• Fixed the redirect from / to /ui when the internal web UI (-ui option) is enabled. [GH-1713]
• Updated memberlist to pull in a fix for leaking goroutines when performing TCP fallback pings. This affected users with frequent UDP connectivity problems. [GH-1802]
• Added a fix to trim UDP DNS responses so they don't exceed 512 bytes. [GH-1813]
• Updated go-dockerclient to fix Docker health checks with Docker 1.10. [GH-1706]
• Removed fixed height display of nodes and services in UI, leading to broken displays when a node has a lot of services. [GH-2055]