Hermes agent plugin: Where did all my tokens go?

Axiom’s hermes-metrics is an Apache-2.0/MIT-licensed observability plugin for the open-source Hermes agent that converts Hermes observer hooks into OpenTelemetry traces, metrics, and limited failure logs, allowing users to track sessions, model calls, tools, approvals, subagents, token usage, latency, and estimated spending. To avoid slowing agent execution, the plugin places hook events into a bounded asynchronous queue and drops excess events rather than blocking, while exporting its own health counters and queue-depth metrics so data loss or reporting failures can trigger alerts. It calculates costs from provider pricing routes while avoiding double-counting reasoning tokens and treating subscription-covered usage as zero cost, exports pricing rates to reveal provider changes, and seeds tool metrics from installed tools so unused tools remain visible. Setup can provision Axiom datasets, restricted write tokens, dashboards, and seven monitors for telemetry drops, errors, token consumption, spending, and subagent concurrency. Privacy controls use cumulative redaction levels that default to metadata only, never transmit prompts or conversation histories, and mask credential-like field names, though secrets embedded in arbitrary values are not detected. The plugin is designed to fail without disrupting the agent, handling missing dependencies, export failures, and schema mismatches through warnings and diagnostic events.

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