add scan_signature tag with message for datadog

[chaosoldier chaos (chaosoldier)]

add scan_signature tag with message for datadog.

[CLAassistant]

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❌ 上原 雄太
❌ chaosoldier

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[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.
1 out of 2 committers have signed the CLA.

✅ chaosoldier
❌ 上原 雄太

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上原 雄太 seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}