Austin McKinley
55 lines
1.5 KiB
TypeScript
55 lines
1.5 KiB
TypeScript
import {collectDefaultMetrics, Gauge, Registry} from 'prom-client'
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import {type AppContext} from './context.js'
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let runtimeRegistry: Registry | undefined
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const getRuntimeRegistry = (): Registry => {
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if (!runtimeRegistry) {
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runtimeRegistry = new Registry()
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// Beyla already exports HTTP RED metrics and traces for Blink. These
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// process metrics cover the runtime-only failure modes it cannot see,
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// particularly event-loop stalls, GC pauses, and V8 heap pressure.
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collectDefaultMetrics({register: runtimeRegistry})
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}
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return runtimeRegistry
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}
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export const createPrometheusRegistry = (ctx: AppContext): Registry => {
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const poolRegistry = new Registry()
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new Gauge<'state'>({
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name: 'bskylink_db_pool_connections',
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help: 'PostgreSQL client connections by usage state.',
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labelNames: ['state'],
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registers: [poolRegistry],
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collect() {
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const {idleCount, totalCount} = ctx.db.cfg.pool
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this.set({state: 'idle'}, idleCount)
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this.set({state: 'in_use'}, totalCount - idleCount)
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},
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})
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new Gauge({
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name: 'bskylink_db_pool_max_connections',
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help: 'Configured maximum PostgreSQL client connections.',
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registers: [poolRegistry],
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collect() {
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this.set(ctx.cfg.db.pool.size)
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},
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})
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new Gauge({
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name: 'bskylink_db_pool_waiting_requests',
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help: 'Requests waiting for a PostgreSQL client connection.',
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registers: [poolRegistry],
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collect() {
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this.set(ctx.db.cfg.pool.waitingCount)
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},
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})
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return Registry.merge([getRuntimeRegistry(), poolRegistry])
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}
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