Add methods to retrieve messages from the local and remote PI Message Logs where remote can refer a PI Data Archive node or any remote PINS.

Because the EventLog Class in .NET Framework provides access to local and remote Event Logs, offering the AF (Server) Event Log through PI AF SDK is not necesarry.

As of now, we can get PINetMgr statistics via PowerShell command Get-PIConnectionStatistics. # of users familiar with AF SDK are more than with PowerShell.
It will be nice feature addition in AF SDK, and usability will also increased.

The ability to backfill an analysis using an end time in the future. This would read data from future inputs and write the results as future values.

As a developer of custom applications that use the PI  AF SDK, I'd like to be able to easily determine if an attribute based of an attribute template is configured for tag creation. Currently the AF Attribute Template class does not have this property. The current work around is to look at the configuration string which is less efficient.

Expose interfaces for asynchronous data method calls (ex. InterpolatedValues, PlotValues, RecordedValues, Summaries) that:
    1. Take an asynchronous enumerable of `AFAttribute`s as input
    2. Output an asynchronous enumerable of results
    3. Throttle the calls made to PI Data Archive so that it does not overwhelm it

The use case is to be able to make end-to-end asynchronous data method calls on a set of AFAttributes.

To help with quicker deployment, having AF SDK as a nuget package would speed up development and lower barrier to developing against a PI System.

Currently the PIPointQuery cannot contain a filter condition with same filter name twice per AND condition of the query string.

PointId:>5 AND PointId:<10.

This would cause an error.

Therefore filtering for a certain range is annoying as both result lists then have to be compared for common elements, workaround for the AND in above condition.

Enhancement:

Introduce a "BETWEEN" operator for the filter condition.

Allow multiple use of filter names in the same AND condition.

PI AF SDK - Search Query Syntax - Filters

Allow results to be ORed. Currently Results can only be ANDed.

The UpdateValues method does not implement by itself the exception mechanism. Exception is applied on the client side, for instance by UniInt interfaces.

As a developer,  I would like this fact to be mentioned in the documentation to avoid confusion:
https://techsupport.osisoft.com/Documentation/PI-AF-SDK/html/M_OSIsoft_AF_Data_AFData_UpdateValues_1.htm

With Microsoft supporting .NET Core on Linux operating systems such as RHEL, SLES Ubuntu, CentOS, and Debian.
https://docs.microsoft.com/en-us/dotnet/core/about
https://docs.microsoft.com/en-us/dotnet/core/linux-prerequisites?tabs=netcore2x

They are even supporting SQL Server on Linux OS'es.

I don't know the dependencies of the AF SDK nor the Web API, but if they can use .NET Core; it would be nice to have the AF SDK and Web API available for Linux based OS'es.

The PIPoint.ReplaceValues method requires a replacement of every event in the timerange, however it also may reorder or miss events with the same time stamp. The issue is that if the client wants to replace only a certain event, but must find that event - the replacement is for all the events at that timestamp and the method doesn't seem to allow for precise replacement of a value.
The use case is programmatic correction of operator manual entry error, where multiple events have the same timestamp.

As a programmer, I would like to search for and return elements with attributes that contain bad values  using the AFElementSearch Class in the AF SDK.

Several customers have asked for ability to search on multiple categories.  I understand from developers that a generic OR in AFSearch can be quite expensive, but allowing for search filter Category to support Equal or IN should not be expensive.

Recalculate an Event Frame after a manual entry through PI Vision.
So after inserting data in a manual manner, I want to be able to automatically recalculate the EF. In new AF version this works for analysis but not for EF. There is a way to do program it by using PI AF SDK? I would be happy if this can be done already from PI Vision with PIweb API.

Currently, a method like PIServer.CreatePIPoints returns AFListResults<String, PIPoint>. Very similarly, PIPoint.FindPIPointsByPath will return AFKeyedResults<String, PIPoint>. The functionality of each result is essentially the same; they even have, for most practical purposes, the same associated properties and methods and thus; they should not be different object types.

Sharing an object type across all of these PIPoint-related functionalities would allow developers to more easily share methods for these related functions (Such as error handling methods).

I would like to aggregate multiple tag values in a server side operation using naturally scheduled or sampled intervals in some form similar or extending FilteredSummaries.

Most common case is finding the maximum aggregate of two or more tags.

It's not practical to rely on Analysis for adhoc use cases.

Currently, the AFSKD GetValue() method supports GetValue().ValueAsInt32, .ValueAsDouble, and .ValueAsSingle. However, there are other possible AF Value Types, such as "Boolean". The AFSDK should expand the GetValue().ValueAs functionality to include all possible AF Value Types.