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Documents only. The byte limits and byte anomaly thresholds count body bytes, as SWW_BYTES_COUNT chooses them, with WebSocket traffic each way, once a response has ended; the request that passes a limit is not cut off and the client is banned. README.md, SPEC.md and docs/ now say so, and no longer call a response's bytes the request's. Also made plain: rate limits and their exemptions, the refusal threshold, SWRP_MAX_REQUEST_TIME_MS, SWRP_MAX_RESPONSE_SIZE, SWW_LOOKUP_SOURCE, SWW_LIMIT_BAN_REPEAT_WINDOW, the metrics' byte series, and the SPEC.md claim about answering within SWRP_TIMEOUT_MS. EVALUATION.md is audited too; its survey facts and date are unchanged. Model: fable-5-1 (first audit); opus-5-5 (rework)
88 lines
3.2 KiB
Markdown
88 lines
3.2 KiB
Markdown
# The metrics
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What `GET /_sww/metrics` answers with, at `discriminator`'s own address.
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"Metrics endpoint" in [`SPEC.md`](../SPEC.md) describes the endpoint. Prometheus
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keeps the `instance` label as `exported_instance` unless the scrape sets
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`honor_labels: true`. `rproxy` has no metrics.
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Every `sww_*request_bytes_total` and `sww_*response_bytes_total` series counts
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body bytes, never headers, whatever `SWW_BYTES_COUNT` says.
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## Traffic
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- `sww_requests_total`, `sww_request_bytes_total` and
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`sww_response_bytes_total`, by `status_class` such as `2xx` and by `action`;
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- `sww_request_duration_seconds` and `sww_upstream_duration_seconds`, as
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histograms;
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- `sww_requests_in_flight`: the questions and requests to its own endpoints that
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`discriminator` is handling.
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## Limits and bans
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- `sww_rate_limit_hits_total`, by `window` and by `kind` (`requests`, `bytes` or
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`refusals`);
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- `sww_offences_total`, by `kind`;
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- `sww_bans_made_total`, by `cause`;
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- `sww_active_bans` and `sww_permanent_bans`.
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## Attack detection
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- `sww_rule_matches_total`, by `rule_id` and `action`, and `sww_rules_loaded`;
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- `sww_waf_matches_total`, by `mode` and `rule_id`, for the rules that fired.
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## Countries and AS numbers
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For the `SWW_METRICS_TOP_N` busiest of each, the rest as `other`:
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- `sww_country_requests_total`, `sww_country_request_bytes_total`,
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`sww_country_response_bytes_total` and `sww_country_list_refusals_total`, by
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`country`;
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- `sww_asn_requests_total`, `sww_asn_request_bytes_total` and
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`sww_asn_response_bytes_total`, by `asn`.
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## Lookups
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- `sww_geojs_requests_total` and `sww_geojs_failures_total`;
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- `sww_geojs_unanswered_total`: the requests that needed an answer and went on
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without it;
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- with the file source, `sww_lookup_database_last_read_timestamp_seconds` and
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`sww_lookup_database_read_failures_total`.
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## Reputation sources
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By `source`: each list's URL, each zone, and `abuseipdb`:
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- `sww_reputation_hits_total`, `sww_reputation_queries_total` and
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`sww_reputation_failures_total`;
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- `sww_reputation_last_fetch_timestamp_seconds`, for a list;
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- `sww_reputation_daily_budget_remaining`, for AbuseIPDB.
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## State files
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By `file`:
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- `sww_state_file_writes_total`, `sww_state_file_write_failures_total`,
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`sww_state_file_last_write_timestamp_seconds` and `sww_state_file_size_bytes`;
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- `sww_state_file_edits_taken_in_total` and
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`sww_state_file_edits_set_aside_total`;
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- `sww_tracked_clients`: the clients in the table.
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## Remote log, alerts and the process
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- while a syslog server is set, `sww_remote_log_lines_sent_total`,
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`sww_remote_log_lines_dropped_total` and `sww_remote_log_buffer_depth`;
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- by `destination`, `sww_alerts_sent_total`, `sww_alerts_failed_total`,
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`sww_alerts_suppressed_total` and `sww_alerts_dropped_total`;
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- Go's own `go_` metrics and the process's `process_` metrics.
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## When a request is counted
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`discriminator` counts a denied request at its decision, and a request to its
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own endpoints when it is answered. It counts an allowed request when its report
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comes, with the status, bytes and times the report gives. These are not counted:
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- a report itself;
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- an allowed request whose report never comes;
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- a question refused with `400`;
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- a question whose body stopped arriving.
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