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add istio whitelist resources

Stephen Galamb requested to merge sg-38-istio-whitelist-thanos into main

General MR

Summary

Adding the ability to create a sidecar for Istio whitelisting

Relevant logs/screenshots

Big Bang pipeline passing

Linked Issue

issue

Upgrade Notices

A Sidecar resource has been added to the Thanos namespace that disallows egress to endpoints that are not part of the Istio service registry (a.k.a REGISTRY_ONLY). The outboundTrafficPolicy.mode in the Sidecar can be configured, however, to be something other than REGISTRY_ONLY if desired by setting istio.hardened.outboundTrafficPolicyMode. This provides a redundant layer of network security in addition to NetworkPolicies. This Sidecar is disabled by default but can be enabled by setting istio.enabled: true and istio.hardened.enabled: true.

Additionally, custom ServiceEntries can be created by populating the istio.hardened.customServiceEntries list.

Edited by Stephen Galamb

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