58 lines
2 KiB
Markdown
58 lines
2 KiB
Markdown
# Core Hub PostgreSQL capacity preflight — 2026-08-20
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Workplan: `RPF-WP-0021-T02`
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Target: railiance01 `databases/platform-pg`
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Mode: live, read-only, non-secret
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## Purpose
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Record the current `platform-pg` resource posture before reviewing Core Hub as
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the fourth declaration on the cell. This is an admission preflight, not the
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controlled multi-consumer measurement required by `rapp-postgres` ADR-0004.
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## Observed baseline
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Collected through `ssh railiance01` using `kubectl top`, pod resource metadata,
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and read-only `pg_stat_activity` / database-size queries.
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| Signal | Observation |
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| --- | --- |
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| PostgreSQL pod CPU | 9m |
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| PostgreSQL pod memory | 362Mi |
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| CPU request / limit | 100m / 1 core |
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| Memory request / limit | 256Mi / 1Gi |
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| `max_connections` | 100 |
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| `shared_buffers` | 128MB |
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| `work_mem` | 4MB |
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| `maintenance_work_mem` | 64MB |
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Connection snapshot:
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| Database | Total | Active | Idle |
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| --- | ---: | ---: | ---: |
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| `audit_core` | 1 | 0 | 1 |
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| `postgres` | 2 | 1 | 1 |
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| no database | 6 | 0 | 0 |
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Database sizes were approximately 8MiB each for `audit_core`,
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`isolation_probe`, `platform_meta`, `postgres`, and `template1`.
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## Interpretation
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- The pod was using about 35% of its 1Gi memory limit during this quiet
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snapshot. That is useful headroom evidence and not a peak or per-backend
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measurement.
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- `tenant_engine` was not present in the database list, so this sample does
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not exercise the declared second workload consumer.
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- Core Hub would reach the four-declaration ceiling after `audit-core`,
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`tenant-engine`, and the counted isolation probe. It does not exceed the
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ceiling if the stale, untracked Issue Core draft is removed as required by
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`ISSUE-WP-0007`.
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- This snapshot does **not** close ADR-0004 section 5. Admission still needs a
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coordinated measurement with the declared consumers active, including
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connection/backend memory under representative load and a recorded peak.
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No PostgreSQL credential, query payload, tenant identifier, or secret value
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was read or recorded.
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