istio

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apiVersion: release-notes/v2
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kind: bug-fix
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area: networking
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issue:
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  - 29427
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  - 28516
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upgradeNotes:
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  - title: Connectivity issues among your proxies when updating from 1.7.x to 1.7.5 or newer.
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    content: |
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      When upgrading your Istio data plane from 1.7.x (where x < 5) to 1.7.5 or newer, you may 
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      observe connectivity issues between your gateway and your sidecars or among your sidecars 
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      with 503 errors in the log. This happens when 1.7.5+ proxies send HTTP 1xx or 204 response 
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      codes with headers that 1.7.x proxies reject. To fix this, upgrade all your 
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      proxies (gateways and sidecars) to 1.7.5+ as soon as possible.
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