common_templates/_tls_helpers.tpl has common configuration for envoy that should be used by all charts. T291504: eventgate helm chart should use common_templates _tls_helpers.tpl instead of its own custom copy is about making eventgate use common_templates.

We attempted that today, but ran into some mistakes resulting from confusion around naming of labels. T291848: Clarify common k8s label and service conventions in our helm charts is about clarifying this confustion.

While we work on resolving those, we can update eventgate's custom _tls_helpers.tpl file to make it more like the common template. This will allow us to log http errors that envoy sees, which will help us investigate T215001: Revisions missing from mediawiki_revision_create