1.0.0 rc3

[nkorange]

Please do not create a Pull Request without creating an issue first.

What is the purpose of the change

Brief changelog

• [Switch 'serverMode' change to 'instanceDefaultEphemeral' #998] Switch 'serverMode' change to 'instanceDefaultEphemeral'
• [PropertyUtil may fail to close stream #986] PropertyUtil may fail to close stream
• [[INFORM] Nacos cluster management implementation rejected in Apache SkyWalking #981] [INFORM] Nacos cluster management implementation rejected in Apache SkyWalking
• [ArrayIndexOutOfBoundsException may be thrown when invokes taskDispatcher.addTask #974] ArrayIndexOutOfBoundsException may be thrown when invokes taskDispatcher.addTask
• [cluster.conf file handle not released #973] cluster.conf file handle not released
• ["checkTask NPE" occur when cluster not init #961] "checkTask NPE" occur when cluster not init
• [Api GET /instance should return 404 if no matched ip found #948] Api GET /instance should return 404 if no matched ip found
• [Add preserved metadata keys #911] Add preserved metadata keys
• [Persistent instance should not send client beat #910] Persistent instance should not send client beat

Verifying this change

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• Make sure there is a Github issue filed for the change (usually before you start working on it). Trivial changes like typos do not require a Github issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Format the pull request title like [ISSUE #123] Fix UnknownException when host config not exist. Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add integration-test in test module.
• Run mvn -B clean package apache-rat:check findbugs:findbugs -Dmaven.test.skip=true to make sure basic checks pass. Run mvn clean install -DskipITs to make sure unit-test pass. Run mvn clean test-compile failsafe:integration-test to make sure integration-test pass.

[CLAassistant]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
6 out of 7 committers have signed the CLA.

✅ nkorange
✅ yanlinly
✅ hxy1991
✅ jifengnan
✅ xuechaos
✅ neatlife
❌ alios-studio
_{You have signed the CLA already but the status is still pending? Let us recheck it.}