Jinwoo Hong
2524737ef0
* chore(relay): target each cell's backend service from the same-cap job
The 60 s connection drain timeout merged in #21848 has no safe apply path.
A root plan scoped to the backend services alone still pulls every
`google_compute_instance_template.relay_gce_cell` in as a dependency, and
standing image drift turns all 29 into replacements, so applying it would roll
the fleet at once.
Add `google_compute_backend_service.relay_gce_cell["${TARGET_CELL_ID}"]` to
both plan invocations in the per-cell same-cap job, next to the template and
MIG it already targets, and teach the reviewed plan validator to allow exactly
one extra change: an in-place update of that one cell's backend whose only
changed attribute is `connection_draining_timeout_sec`, landing on the
constant `validate-relay-asia-topology-plan.mjs` exports. Any other attribute,
any other resource, or a backend for another cell still fails the validator.
The accepted update is reported as `connectionDrainUpdate` and kept out of
`changes`, so the apply step's stranded branch and the resume step's drift
branch keep reading the template-and-MIG count they were written against; the
resume branch additionally accepts a plan whose only pending change is that
drain update, which restarts nothing.
Claude-Session: relay-same-cap-targets-cell-backend
* fix(relay): also let the same-cap wave apply this cell's LB request logging
A read-only production plan for production-gce-c7 showed the live US cell
backends carry no `log_config` at all, while relay-gce-cells.tf has declared
`log_config { enable = true, sample_rate = var.relay_gce_cell_log_sample_rate }`
on every cell backend since the Terraform root landed in 3eec77c11a (#18413).
Nothing has applied it because every production apply since is a per-cell
targeted plan that names only the template and the MIG.
So the real canary plan's backend moves two paths, not one:
`["connection_draining_timeout_sec", "log_config.0"]`. The drain-only validator
rejected exactly that plan, which would have stranded the cell mid-wave after
the drain had already started.
Accept both, each optional, for this cell's backend only: the drain landing on
RELAY_CELL_CONNECTION_DRAIN_SECONDS, and a log_config of exactly one block with
`enable = true` and `sample_rate` equal to RELAY_CELL_LOG_SAMPLE_RATE, the
declared default of a variable no environment file overrides. Any third path,
a different sample rate, disabled logging, another cell, or a replacement still
fails. The accepted paths are reported as `backendUpdate`, which the resume
branch now reads instead of the drain-only flag.
Verified against the real production plan: the masked, three-target plan for
production-gce-c7 contains exactly that cell's template, MIG, and backend
service and nothing else, and this validator returns
`{"changes":2,"backendUpdate":["connection_draining_timeout_sec","log_config.0"]}`.
Claude-Session: relay-same-cap-targets-cell-backend
Orca
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