The code behind plan §7.3-7.6:
- breaker: folds cooldown and circuit breaking into one component
(FailureThreshold=1 gives LiteLLM-style cooldown), with exponential backoff
and half-open probes.
- endpoint: live state registry. Inflight counting, staleness detection, drain
rate derived from counters. A scrape failure does not trip the breaker — the
engine may be serving fine while only its metrics endpoint is down.
- scrape: parses the §7.6 metric contract. Errors when any of the mandatory
three is missing; the metric name mapping is overridable, since names drift
between versions (plan §14).
- scheduler: the filter -> score -> pick pipeline. A "strategy" is now just a
set of scorer weights; chat, batch and long-context are the same code with
different weights. Scorers: queue, kv (hard penalty above the ceiling),
inflight, load, weight, session (bounded-load consistent hashing). Pickers:
max-score, p2c, softmax, round-robin.
Decision carries the rationale — which scorer produced what, which filter
dropped how many. Tuning the weights without that is guesswork.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
ilkerandClaude Opus 5
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