Logging pollutes log messages of contained programs

You are opening a bug report against the LibGit2Sharp project: we
use GitHub Issues for tracking bug reports and feature requests. If
you have a question about an API or usage, please ask on StackOverflow:
http://stackoverflow.com/questions/tagged/libgit2sharp.

Otherwise, to report a bug, please fill out the reproduction steps
(below) and delete these introductory paragraphs. Thanks!

Reproduction steps

Set GlobalSettings.LogConfiguration
Pass log messages from libgit2sharp to your own logging solution

Expected behavior

Libgit2sharp does not send an unidentifiable Logging enabled at level logmessage that we cannot disable

Actual behavior

Libgit2sharp sends an unidentifiable Logging enabled at level logmessage that we cannot disable and which confuses our users because it is not the same loglevel name as they set in our app config.

Version of LibGit2Sharp (release number or SHA1)

Operating system(s) tested; .NET runtime tested

首先跟踪 GlobalSettings.LogConfiguration，找到确切消息 "Logging enabled at level" 的来源。验证消息是如何发出的，以及配置的 logging 行为是否可以抑制该消息或正确识别它；完成标准是所包含的程序不再收到无法识别的消息。