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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import {
metrics,
Attributes,
ValueType,
Meter,
Counter,
Histogram,
} from '@opentelemetry/api';
import {
SERVICE_NAME,
METRIC_TOOL_CALL_COUNT,
METRIC_TOOL_CALL_LATENCY,
METRIC_API_REQUEST_COUNT,
METRIC_API_REQUEST_LATENCY,
METRIC_TOKEN_USAGE,
METRIC_SESSION_COUNT,
} from './constants.js';
import { Config } from '../config/config.js';
let cliMeter: Meter | undefined;
let toolCallCounter: Counter | undefined;
let toolCallLatencyHistogram: Histogram | undefined;
let apiRequestCounter: Counter | undefined;
let apiRequestLatencyHistogram: Histogram | undefined;
let tokenUsageCounter: Counter | undefined;
let isMetricsInitialized = false;
function getCommonAttributes(config: Config): Attributes {
return {
'session.id': config.getSessionId(),
};
}
export function getMeter(): Meter | undefined {
if (!cliMeter) {
cliMeter = metrics.getMeter(SERVICE_NAME);
}
return cliMeter;
}
export function initializeMetrics(config: Config): void {
if (isMetricsInitialized) return;
const meter = getMeter();
if (!meter) return;
toolCallCounter = meter.createCounter(METRIC_TOOL_CALL_COUNT, {
description: 'Counts tool calls, tagged by function name and success.',
valueType: ValueType.INT,
});
toolCallLatencyHistogram = meter.createHistogram(METRIC_TOOL_CALL_LATENCY, {
description: 'Latency of tool calls in milliseconds.',
unit: 'ms',
valueType: ValueType.INT,
});
apiRequestCounter = meter.createCounter(METRIC_API_REQUEST_COUNT, {
description: 'Counts API requests, tagged by model and status.',
valueType: ValueType.INT,
});
apiRequestLatencyHistogram = meter.createHistogram(
METRIC_API_REQUEST_LATENCY,
{
description: 'Latency of API requests in milliseconds.',
unit: 'ms',
valueType: ValueType.INT,
},
);
tokenUsageCounter = meter.createCounter(METRIC_TOKEN_USAGE, {
description: 'Counts the total number of tokens used.',
valueType: ValueType.INT,
});
const sessionCounter = meter.createCounter(METRIC_SESSION_COUNT, {
description: 'Count of CLI sessions started.',
valueType: ValueType.INT,
});
sessionCounter.add(1, getCommonAttributes(config));
isMetricsInitialized = true;
}
export function recordToolCallMetrics(
config: Config,
functionName: string,
durationMs: number,
success: boolean,
decision?: 'accept' | 'reject' | 'modify',
): void {
if (!toolCallCounter || !toolCallLatencyHistogram || !isMetricsInitialized)
return;
const metricAttributes: Attributes = {
...getCommonAttributes(config),
function_name: functionName,
success,
decision,
};
toolCallCounter.add(1, metricAttributes);
toolCallLatencyHistogram.record(durationMs, {
...getCommonAttributes(config),
function_name: functionName,
});
}
export function recordTokenUsageMetrics(
config: Config,
model: string,
tokenCount: number,
type: 'input' | 'output' | 'thought' | 'cache' | 'tool',
): void {
if (!tokenUsageCounter || !isMetricsInitialized) return;
tokenUsageCounter.add(tokenCount, {
...getCommonAttributes(config),
model,
type,
});
}
export function recordApiResponseMetrics(
config: Config,
model: string,
durationMs: number,
statusCode?: number | string,
error?: string,
): void {
if (
!apiRequestCounter ||
!apiRequestLatencyHistogram ||
!isMetricsInitialized
)
return;
const metricAttributes: Attributes = {
...getCommonAttributes(config),
model,
status_code: statusCode ?? (error ? 'error' : 'ok'),
};
apiRequestCounter.add(1, metricAttributes);
apiRequestLatencyHistogram.record(durationMs, {
...getCommonAttributes(config),
model,
});
}
export function recordApiErrorMetrics(
config: Config,
model: string,
durationMs: number,
statusCode?: number | string,
errorType?: string,
): void {
if (
!apiRequestCounter ||
!apiRequestLatencyHistogram ||
!isMetricsInitialized
)
return;
const metricAttributes: Attributes = {
...getCommonAttributes(config),
model,
status_code: statusCode ?? 'error',
error_type: errorType ?? 'unknown',
};
apiRequestCounter.add(1, metricAttributes);
apiRequestLatencyHistogram.record(durationMs, {
...getCommonAttributes(config),
model,
});
}
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