Re: [RFC PATCH v1] telemetry design overview (part 1)

From: Thomas Braun <thomas.braun@virtuell-zuhause.de>
Date: Jun 8, 2018, 16:00 UTC
Message-ID: <688240ef-34a1-ee9a-215a-b4f9628e7c72@virtuell-zuhause.de>
In-Reply-To: <20180608090758.GA15112@sigill.intra.peff.net>

Am 08.06.2018 um 11:07 schrieb Jeff King:

Show 17 quoted lines

> On Thu, Jun 07, 2018 at 11:10:52PM +0200, Johannes Sixt wrote:
> 
>> Am 07.06.2018 um 16:53 schrieb git@jeffhostetler.com:
>>> From: Jeff Hostetler <jeffhost@microsoft.com>
>>>
>>> I've been working to add code to Git to optionally collect telemetry data.
>>> The goal is to be able to collect performance data from Git commands and
>>> allow it to be aggregated over a user community to find "slow commands".
>>
>> Seriously? "add code to collect telemetry data" said by somebody whose email
>> address ends with @microsoft.com is very irritating. I really don't want to
>> have yet another switch that I must check after every update that it is
>> still off.
> 
> If you look at the design document, it's off by default and would write
> to a file on the filesystem. That doesn't seem all that different from
> GIT_TRACE.

The patch also includes the following part

+telemetry.plugin
+----------------
+
+If the config setting "telemetry.plugin" contains the pathname to a shared
+library, the library will be dynamically loaded during start up and events
+will be sent to it using the plugin API.
+
+This plugin model allows an organization to define a custom or private
+telemetry solution while using a stock version of Git.
+
+For example, on Windows, it allows telemetry events to go directly to the
+kernel via the plugin using the high performance Event Tracing for Windows
+(ETW) facility.
+
+The contrib/telemetry-plugin-examples directory contains two example
+plugins:
+ * A trivial log to stderr
+ * A trivial ETW writer

which is not a file but, if enabled, some windows internal thingie where the data is gone/duplicated/sent out/whatever.

I for my part would much rather prefer that to be a compile time option so that I don't need to check on every git update on windows if this is now enabled or not.