A Redis sidecar whose consumer declares no services.redis.mem_limit
runs in a container that inherits the consumer's primary entity limit.
Since the lookup replaced the old filter, maxmemory followed that limit
and rose from 204 MiB to between 819 and 3276 MiB in 17 roles.
lookup('service_memory_mb', ..., provider=<role>) caps the result at
the same share of the provider's own limit when the application does
not declare one for that service. A declared limit is not capped, and a
container smaller than the provider keeps its own share. The Redis
sidecar passes provider='svc-db-redis': those 17 roles get 409 MiB, the
seven with a 256 MiB container stay at 204.
The lookup now rejects unknown options and a provider that is no role
or declares no limit for the service, so a misspelled option fails
instead of silently lifting the cap.
The memcached sidecar's literal -m 64 takes the same lookup and keeps
its value.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
lookup('service_memory_mb', application_id, service_name, share) returns
a share of a service's mem_limit in whole MiB. It resolves the limit the
way sys-svc-container resolves the container's own: the named service,
then the role's primary entity, then RESOURCE_MEM_LIMIT.
It replaces the three filters of memory_filters, each with its own unit
parser and its own idea of the limit: Redis maxmemory at 0.8 of the
limit, and the Confluence and Jira heap at 0.7 and 0.35.
The central Redis (409 MiB), Confluence (5734/2867) and Jira (4300/2150)
keep their values. A Redis sidecar without a mem_limit of its own does
not: the filter fell back to a fixed 256m, which gave 204 MiB, while the
lookup takes the limit that container really runs with, the primary
entity's. That moves 25 roles to between 409 and 3276 MiB.
The heap clamps of the old filters are gone: the 1024 MiB floor, limit
minus 1024, the 12288 cap and Xms bounded by mem_reservation.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
kevinveenbirkenbachandClaude Opus 5.5