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CKA study material · question 300 of 1000

What are the length limits on a label key?

  1. There is no limit on either part
  2. The name segment is at most 253 characters and the prefix at most 63
  3. The name segment is at most 63 characters and the optional prefix at most 253
  4. The whole key is at most 63 characters
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Answer: C. The name segment is at most 63 characters and the optional prefix at most 253

A label key's name segment is capped at 63 characters and its optional DNS-subdomain prefix at 253.

Source: Labels and Selectors (Kubernetes) — Syntax and character set

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