Zend Server versions

v8.5 [Aug 5, 2015]
Session Clustering: SCD restart randomly failing(ZSRV-15493)
When Zend Server loses connection to MySQL (MySQL is down or not responding ), the Apache processes start to segfault (ZSRV-15499)
In some rare cases the system did not recover from boot (ZSRV-15410)
Job Queue: number of running jobs per Queue exceeded the limit specified in Queue Settings -> Max con concurrent jobs (ZSRV-15360)
IBM i: opcache.error_log missing leading '/' (ZSRV-15366)
Power 8: in some cases there were segmentation faults in GD extensions (ZSRV-14267)
Z-Ray stopped gathering information when there was a notice or an error (ZSRV-15434)
Several issues when using https with Z-Ray Live! (ZSRV-15466)
Zend Framework 1: segmentation fault in error log of Apache (ZSRV-15387)
Inconsistent GUI behavior when user connects via https with Chrome (ZSRV-15464)
Add support for IBM i 7.3 OS (ZSRV-15479).

v7.0 [Jul 3, 2014]
- Z-Ray might be blocked by using the browser content security policy (e.g PHPMyADmin on firefox)
- Specific configuration is required in order for Z-Ray to collect and display data on HTTPS requests in Windows with IIS and IBMi (needs specific configuration)
- Load balancer configuration is required for Z-Ray to be displayed :
- An accessible ZS GUI address must be set
- The Load Balancer IP address must be included in the Z-Ray allowed IPs list (token)
- Z-Ray is not to be included or enabled in performance tests context (e.g in AB testing)
- Z-Ray currently supports the following database drivers: PDO, MySQL/i, OCI8 and DB2

v6.1 [Jul 3, 2013]
1. PHP code library management
Deployment and management of PHP code libraries is now supported as part of Zend Server's application deployment capabilities. This central management means that application packages can be smaller and don't require duplicating libraries in each package, multiple library versions can be used and tracked, library patching/updating is easier, and setting up dependencies to Zend Framework and other 3rd-party or custom libraries is simplified.
2. Enhanced mobile and web user dashboards and metrics
Dynamic real-time dashboards provide insight into how end-users are using applications running on Zend Server. From response time to system utilization, from request processing breakdowns to geographic locations of users, Zend Server shows the information needed to understand at a deep level how applications are behaving. And mobile-specific charts let application owners understand any differences between their mobile and web audiences.

v6.0 [Nov 1, 2012]
Architecture
Database Centric Architecture
Zend Server 6 employs a new database-centric architecture designed to enable painless scaling in both cloud and on premise environments. Zend Server now uses the database to synchronize configuration information, validate settings, deploy applications, collect data and issue commands – allowing for a high performance, and extremely robust solution that can easily scale to hundreds of nodes.
Customizable Restart Strategy
For those situations where the Web Server or Zend Server components need to be restarted, Zend Server 6 now allows administrators to configure how many servers may be restarting at the same time – either as an absolute number, or as a percentage of the whole cluster.
Cluster Manager No Longer Needed
There’s no longer a need for a special ‘Cluster Manager’ node; all nodes in the cluster are identical, and they all serve end-user requests.
Full Web Service Enablement
Zend Server 6 is fully web service enabled. Each and every Zend Server capability – including provisioning, application deployment, automated cluster management, job queuing and more – are all accessible using APIs, unlocking the full power of Zend Server for programmatic access. In fact, the new user interface is implemented as an HTML5/JavaScript client application that consumes these backend services.
Application Centric Approach
Application Trends
Zend Server 6 has a monitoring dashboard that gives an application by application view of key metrics, in addition to a server-wide or cluster-wide view. This is ideal for cloud based deployments, where the infrastructure layer might be virtualized and an application may span multiple resources.
Unmanaged Applications Support
Starting with Zend Server 6, existing applications – that were not deployed used using Zend Server’s deployment mechanism, can now be imported and managed(*) using a simple wizard that only takes a few seconds to run.
(*) Update & rollback not supported
Per-app Rules
Monitoring and Caching rules can now be configured separately for each application, providing custom notification levels for issues such as slow execution, PHP errors, high memory usage or even application-specific events.
Bundled Monitoring & Caching Rules
Application packages can now include optional per-app Monitoring and Caching rules, which will be imported into Zend Server’s configuration as a part of the deployment process. That enables application developers to distribute their apps with suitable preconfigured thresholds and caching logic, and also enables companies to ensure that applications have the same configuration in both Staging and Production servers.
Per-app Access Credentials
Developer accounts can be configured to have access to only specific applications; This allows administrators to provide different developers with access to only those applications that they’re responsible for.
Entirely Redesigned User Interface
-UI
Zend Server 6 has a brand new UI that was written from scratch on top of Zend Framework 2. It uses a modern 2-tiered architecture with separation of the frontend – written in HTML 5 and JavaScript, and the backend – written in PHP. Data and actions are consumed using Web Services.
Redesigned Dashboard
A changed dashboard that gives you an excellent view of your applications’ health and overtime trends at a glance. Switch between seeing information for your entire cluster or a specific app in one click.
Notification Center
Notification Center informs you as soon as there is any issue that requires your immediate attention.
Powerful Monitoring Rule Engine
Up to 3 Thresholds per Rule
Each Monitoring Rule now has up to three different thresholds, allowing for the creation of critical, warning and notice-level events. Each threshold can be configured or completely disabled on a per-rule basis.
Create New Custom Rules
Zend Server 6’s Rule Engine has the ability to create custom rules – based on existing rule types – for your application’s specific needs. For example, you can track your own performance sensitive functions separately from PHP’s performance-sensitive functions. These separate rules can have their own thresholds, and separate action settings.
Create Multiple Custom Event Rules
Starting with Zend Server 6, there can be more than one Custom Event rule. As an example, Zend Framework exceptions are tracked using a dedicated custom rule that’s configured out of the box.

v5.5 [Jul 7, 2011]
The program has a new feature that enables PHP applications deployment through integrated application packaging and automated deployment. This new functionality is available via Zend Server User Interface and WebAPI.