cilium

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[{
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    "labels": [{"key": "name", "value": "l4-rule"}],
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    "endpointSelector": {"matchLabels":{"role":"backend"}},
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    "ingress": [{
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        "fromEndpoints": [
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          {"matchLabels":{"role":"frontend"}}
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        ],
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        "toPorts": [
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            {"ports":[ {"port": "80", "protocol": "TCP"}]}
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        ]
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    }]
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}]
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