query-metrics

name	query-metrics
description	Runs metrics queries against Axiom MetricsDB via scripts. Discovers available metrics, tags, and tag values. Use when asked to query metrics, explore metric datasets, check metric values, or investigate OTel metrics data.

Querying Axiom Metrics

All script paths are relative to this skill's folder; invoke as scripts/<name>. The target dataset must be of kind otel:metrics:v1.

Setup, prerequisites, and ~/.axiom.toml configuration: see README.md. Edge-deployment routing is automatic — the scripts read each dataset's edgeDeployment and route to the right regional endpoint without configuration.

Workflow

1. scripts/datasets <deploy> --kind otel:metrics:v1 — list metrics datasets.
2. scripts/metrics-spec <deploy> <dataset> — required before composing any query. MPL evolves; the spec is the source of truth.
3. scripts/metrics-info <deploy> <dataset> metrics — list metrics with {type, temporality, unit} metadata. Read this before writing the query (see Choosing a Query Shape).
4. scripts/metrics-info <deploy> <dataset> tags [<tag> values] — explore filter dimensions.
5. scripts/metrics-query <deploy> '<MPL>' <start> <end> — execute. Iterate.

If the user names a specific entity (service, host, …), scripts/metrics-info <deploy> <dataset> find-metrics "<value>" finds the metrics carrying it. find-metrics searches tag values, not metric names — don't use it for general discovery.

Choosing a Query Shape

The metrics-info listing returns each metric's {type, temporality, unit}. Read these before composing — never assume a metric is a simple scalar.

Field	Values	Drives
type	Gauge, CounterMonotonic, CounterNonMonotonic, Histogram	Required pre-aggregation operators.
temporality	Cumulative, Delta, null	Whether counter values are running totals or per-interval deltas. null is normal for Gauges.
unit	UCUM string (Cel, kW.h, s, %, [ppm], …) or null	Display unit; preserve when reporting results.

Rules per type (consult metrics-spec for exact operator names — they evolve):

• Gauge — instantaneous value. Align directly with avg/min/max/sum. Don't apply a rate; you'd be averaging meaningless deltas of an instantaneous value.
• CounterMonotonic + Cumulative — running total (resets aside). The raw values are rarely what you want. Convert to a per-second rate first, then align/aggregate.
• CounterMonotonic + Delta — already per-interval. Sum/align without a rate step.
• CounterNonMonotonic — can go up or down (queue depth, balance). Intent is ambiguous: rate, delta, or current value all make sense for different questions. Ask the user before picking one.
• Histogram — not a scalar. align using avg produces nonsense. Use the bucket/quantile operators from metrics-spec.
• temporality: null — "not applicable for this instrument type" (the norm for Gauges), not "missing data".

When surfacing numbers, attach the unit (treat null as unitless). If you combine metrics with mismatched units in arithmetic, warn rather than silently producing a meaningless number.

Query Metrics

scripts/metrics-query <deploy> '<MPL>' <start> <end>

Parameter	Notes
deploy	Name from ~/.axiom.toml (e.g. prod).
MPL	Pipeline string. Dataset is parsed from the MPL itself.
start / end	RFC3339 (2025-01-01T00:00:00Z) or relative (now-1h, now).

Examples:

scripts/metrics-query prod \
  '`my-dataset`:`http.server.duration` | align to 5m using avg' \
  now-1h now

scripts/metrics-query prod \
  '`my-dataset`:`http.server.duration`
   | where `service.name` == "frontend" and method == "GET"
   | align to 5m using avg
   | group by status_code using sum' \
  now-1d now

Parameters

MPL can declare parameters (param $svc: string;). Pass values with repeated -p name=value. The script applies the API's param__ prefix; values are forwarded verbatim as MPL literals (string literals include their quotes).

scripts/metrics-query \
  -p svc='"frontend"' \
  -p window='5m' \
  prod \
  'param $svc: string; param $window: Duration;
   `otel-metrics`:`http.server.duration` | where `service.name` == $svc | align to $window using avg' \
  now-1h now

Required parameters must be supplied; optional ones may be omitted. Resulting request body shape:

{
  "apl": "param $svc: string; …",
  "startTime": "now-1h",
  "endTime": "now",
  "params": { "param__svc": "\"frontend\"", "param__window": "5m" }
}

Literal syntax per type lives in metrics-spec.

Discovery (metrics-info)

Time range defaults to the last 24h; override with --start / --end.

Command	Returns
metrics-info <d> <ds> metrics	All metrics, keyed by name, with {type, temporality, unit}.
metrics-info <d> <ds> metrics --by-type	Same listing grouped by type (client-side reshape).
metrics-info <d> <ds> metrics --type Gauge --type Histogram	Filtered listing (repeatable, OR semantics; composes with --by-type).
metrics-info <d> <ds> metrics <metric> info	Single metric's {type, temporality, unit}. Non-zero exit if absent.
metrics-info <d> <ds> metrics <metric> describe	Bundle: metadata + all tags + tag values in one call (replaces 1+1+N round trips). Flags: --no-values (tag names only), --values-limit N (cap per-tag values; default 50, 0 = unlimited).
metrics-info <d> <ds> metrics <metric> tags	Tags carried by a specific metric.
metrics-info <d> <ds> metrics <metric> tags <tag> values	Tag values for that metric.
metrics-info <d> <ds> metrics <metric> tags <tag> type	Probe whether the tag is int/float/string/bool. Returns {type, present_types}; mixed if multiple types coexist, absent if not present.
metrics-info <d> <ds> tags	All tags in the dataset.
metrics-info <d> <ds> tags <tag> values	All values for a tag (across metrics).
metrics-info <d> <ds> find-metrics "<value>"	Metrics that carry the given tag value (not metric name).

Error Handling

HTTP errors return JSON with message, code, and optional detail:

{"message": "...", "code": 400, "detail": {"errorType": 1, "message": "raw error"}}

Code	Cause
400	Invalid query syntax or bad dataset name
401	Missing/invalid auth
403	No permission
404	Dataset not found
429	Rate limited
500	Internal error

On 500, re-run with curl -v to capture the traceparent / x-axiom-trace-id header and report it — the trace ID is what the backend team needs to debug.

Scripts

Script	Usage
scripts/setup	Check requirements and config.
scripts/datasets <deploy> [--kind <kind>]	List datasets with edge deployment.
scripts/metrics-spec <deploy> <dataset>	Fetch the MPL query spec.
scripts/metrics-query <deploy> <mpl> <start> <end>	Execute a query.
scripts/metrics-info <deploy> <dataset> ...	Discover metrics, tags, values.
scripts/axiom-api <deploy> <method> <path> [body]	Low-level API calls.
scripts/resolve-url <deploy> <dataset>	Resolve to the edge deployment URL.

Run any script without arguments for full usage.