From cd1b8e9a40ad24a57bc6da589b51aa96fe850449 Mon Sep 17 00:00:00 2001 From: Chocobozzz Date: Tue, 19 Jul 2022 11:58:19 +0200 Subject: Add node process metrics --- server/lib/opentelemetry/metric-helpers/index.ts | 2 + .../metric-helpers/job-queue-observers-builder.ts | 24 +++ .../metric-helpers/nodejs-observers-builder.ts | 198 +++++++++++++++++++++ .../metric-helpers/stats-observers-builder.ts | 2 +- server/lib/opentelemetry/metrics.ts | 39 +--- 5 files changed, 232 insertions(+), 33 deletions(-) create mode 100644 server/lib/opentelemetry/metric-helpers/job-queue-observers-builder.ts create mode 100644 server/lib/opentelemetry/metric-helpers/nodejs-observers-builder.ts (limited to 'server/lib') diff --git a/server/lib/opentelemetry/metric-helpers/index.ts b/server/lib/opentelemetry/metric-helpers/index.ts index cabb27326..ff0aff9fd 100644 --- a/server/lib/opentelemetry/metric-helpers/index.ts +++ b/server/lib/opentelemetry/metric-helpers/index.ts @@ -1 +1,3 @@ +export * from './job-queue-observers-builder' +export * from './nodejs-observers-builder' export * from './stats-observers-builder' diff --git a/server/lib/opentelemetry/metric-helpers/job-queue-observers-builder.ts b/server/lib/opentelemetry/metric-helpers/job-queue-observers-builder.ts new file mode 100644 index 000000000..c81959616 --- /dev/null +++ b/server/lib/opentelemetry/metric-helpers/job-queue-observers-builder.ts @@ -0,0 +1,24 @@ +import { Meter } from '@opentelemetry/api-metrics' +import { JobQueue } from '@server/lib/job-queue' + +export class JobQueueObserversBuilder { + + constructor (private readonly meter: Meter) { + + } + + buildObservers () { + this.meter.createObservableGauge('peertube_job_queue_total', { + description: 'Total jobs in the PeerTube job queue' + }).addCallback(async observableResult => { + const stats = await JobQueue.Instance.getStats() + + for (const { jobType, counts } of stats) { + for (const state of Object.keys(counts)) { + observableResult.observe(counts[state], { jobType, state }) + } + } + }) + } + +} diff --git a/server/lib/opentelemetry/metric-helpers/nodejs-observers-builder.ts b/server/lib/opentelemetry/metric-helpers/nodejs-observers-builder.ts new file mode 100644 index 000000000..c51a50ebb --- /dev/null +++ b/server/lib/opentelemetry/metric-helpers/nodejs-observers-builder.ts @@ -0,0 +1,198 @@ +import { readdir } from 'fs-extra' +import { constants, PerformanceObserver } from 'perf_hooks' +import * as process from 'process' +import { Meter, ObservableResult } from '@opentelemetry/api-metrics' +import { ExplicitBucketHistogramAggregation, MeterProvider } from '@opentelemetry/sdk-metrics-base' +import { View } from '@opentelemetry/sdk-metrics-base/build/src/view/View' +import { logger } from '@server/helpers/logger' + +// Thanks to https://github.com/siimon/prom-client +// We took their logic and adapter it for opentelemetry +// Try to keep consistency with their metric name/description so it's easier to process (grafana dashboard template etc) + +export class NodeJSObserversBuilder { + + constructor (private readonly meter: Meter, private readonly meterProvider: MeterProvider) { + } + + buildObservers () { + this.buildCPUObserver() + this.buildMemoryObserver() + + this.buildHandlesObserver() + this.buildFileDescriptorsObserver() + + this.buildGCObserver() + this.buildEventLoopLagObserver() + + this.buildLibUVActiveRequestsObserver() + this.buildActiveResourcesObserver() + } + + private buildCPUObserver () { + const cpuTotal = this.meter.createObservableCounter('process_cpu_seconds_total', { + description: 'Total user and system CPU time spent in seconds.' + }) + const cpuUser = this.meter.createObservableCounter('process_cpu_user_seconds_total', { + description: 'Total user CPU time spent in seconds.' + }) + const cpuSystem = this.meter.createObservableCounter('process_cpu_system_seconds_total', { + description: 'Total system CPU time spent in seconds.' + }) + + let lastCpuUsage = process.cpuUsage() + + this.meter.addBatchObservableCallback(observableResult => { + const cpuUsage = process.cpuUsage() + + const userUsageMicros = cpuUsage.user - lastCpuUsage.user + const systemUsageMicros = cpuUsage.system - lastCpuUsage.system + + lastCpuUsage = cpuUsage + + observableResult.observe(cpuTotal, (userUsageMicros + systemUsageMicros) / 1e6) + observableResult.observe(cpuUser, userUsageMicros / 1e6) + observableResult.observe(cpuSystem, systemUsageMicros / 1e6) + + }, [ cpuTotal, cpuUser, cpuSystem ]) + } + + private buildMemoryObserver () { + this.meter.createObservableGauge('nodejs_memory_usage_bytes', { + description: 'Memory' + }).addCallback(observableResult => { + const current = process.memoryUsage() + + observableResult.observe(current.heapTotal, { memoryType: 'heapTotal' }) + observableResult.observe(current.heapUsed, { memoryType: 'heapUsed' }) + observableResult.observe(current.arrayBuffers, { memoryType: 'arrayBuffers' }) + observableResult.observe(current.external, { memoryType: 'external' }) + observableResult.observe(current.rss, { memoryType: 'rss' }) + }) + } + + private buildHandlesObserver () { + if (typeof (process as any)._getActiveHandles !== 'function') return + + this.meter.createObservableGauge('nodejs_active_handles_total', { + description: 'Total number of active handles.' + }).addCallback(observableResult => { + const handles = (process as any)._getActiveHandles() + + observableResult.observe(handles.length) + }) + } + + private buildGCObserver () { + const kinds = { + [constants.NODE_PERFORMANCE_GC_MAJOR]: 'major', + [constants.NODE_PERFORMANCE_GC_MINOR]: 'minor', + [constants.NODE_PERFORMANCE_GC_INCREMENTAL]: 'incremental', + [constants.NODE_PERFORMANCE_GC_WEAKCB]: 'weakcb' + } + + this.meterProvider.addView( + new View({ aggregation: new ExplicitBucketHistogramAggregation([ 0.001, 0.01, 0.1, 1, 2, 5 ]) }), + { instrument: { name: 'nodejs_gc_duration_seconds' } } + ) + + const histogram = this.meter.createHistogram('nodejs_gc_duration_seconds', { + description: 'Garbage collection duration by kind, one of major, minor, incremental or weakcb' + }) + + const obs = new PerformanceObserver(list => { + const entry = list.getEntries()[0] + + // Node < 16 uses entry.kind + // Node >= 16 uses entry.detail.kind + // See: https://nodejs.org/docs/latest-v16.x/api/deprecations.html#deprecations_dep0152_extension_performanceentry_properties + const kind = (entry as any).detail + ? kinds[(entry as any).detail.kind] + : kinds[entry.kind] + + // Convert duration from milliseconds to seconds + histogram.record(entry.duration / 1000, { + kind + }) + }) + + obs.observe({ entryTypes: [ 'gc' ] }) + } + + private buildEventLoopLagObserver () { + const reportEventloopLag = (start: [ number, number ], observableResult: ObservableResult, res: () => void) => { + const delta = process.hrtime(start) + const nanosec = delta[0] * 1e9 + delta[1] + const seconds = nanosec / 1e9 + + observableResult.observe(seconds) + + res() + } + + this.meter.createObservableGauge('nodejs_eventloop_lag_seconds', { + description: 'Lag of event loop in seconds.' + }).addCallback(observableResult => { + return new Promise(res => { + const start = process.hrtime() + + setImmediate(reportEventloopLag, start, observableResult, res) + }) + }) + } + + private buildFileDescriptorsObserver () { + this.meter.createObservableGauge('process_open_fds', { + description: 'Number of open file descriptors.' + }).addCallback(async observableResult => { + try { + const fds = await readdir('/proc/self/fd') + observableResult.observe(fds.length - 1) + } catch (err) { + logger.debug('Cannot list file descriptors of current process for OpenTelemetry.', { err }) + } + }) + } + + private buildLibUVActiveRequestsObserver () { + if (typeof (process as any)._getActiveRequests !== 'function') return + + this.meter.createObservableGauge('nodejs_active_requests_total', { + description: 'Total number of active libuv requests.' + }).addCallback(async observableResult => { + const requests = (process as any)._getActiveRequests() + + observableResult.observe(requests.length) + }) + } + + private buildActiveResourcesObserver () { + if (typeof (process as any).getActiveResourcesInfo !== 'function') return + + const grouped = this.meter.createObservableCounter('nodejs_active_resources', { + description: 'Number of active resources that are currently keeping the event loop alive, grouped by async resource type.' + }) + const total = this.meter.createObservableCounter('nodejs_active_resources_total', { + description: 'Total number of active resources.' + }) + + this.meter.addBatchObservableCallback(observableResult => { + const resources = (process as any).getActiveResourcesInfo() + + const data = {} + + for (let i = 0; i < resources.length; i++) { + const resource = resources[i] + + if (data[resource] === undefined) data[resource] = 0 + data[resource] += 1 + } + + for (const type of Object.keys(data)) { + observableResult.observe(grouped, data[type], { type }) + } + + observableResult.observe(total, resources.length) + }, [ grouped, total ]) + } +} diff --git a/server/lib/opentelemetry/metric-helpers/stats-observers-builder.ts b/server/lib/opentelemetry/metric-helpers/stats-observers-builder.ts index 90b58f33d..3d28ffdd8 100644 --- a/server/lib/opentelemetry/metric-helpers/stats-observers-builder.ts +++ b/server/lib/opentelemetry/metric-helpers/stats-observers-builder.ts @@ -4,7 +4,7 @@ import { MEMOIZE_TTL } from '@server/initializers/constants' import { buildAvailableActivities } from '@server/lib/activitypub/activity' import { StatsManager } from '@server/lib/stat-manager' -export class StatsObserverBuilder { +export class StatsObserversBuilder { private readonly getInstanceStats = memoizee(() => { return StatsManager.Instance.getStats() diff --git a/server/lib/opentelemetry/metrics.ts b/server/lib/opentelemetry/metrics.ts index ca0aae8e7..149f421be 100644 --- a/server/lib/opentelemetry/metrics.ts +++ b/server/lib/opentelemetry/metrics.ts @@ -4,8 +4,7 @@ import { PrometheusExporter } from '@opentelemetry/exporter-prometheus' import { MeterProvider } from '@opentelemetry/sdk-metrics-base' import { logger } from '@server/helpers/logger' import { CONFIG } from '@server/initializers/config' -import { JobQueue } from '../job-queue' -import { StatsObserverBuilder } from './metric-helpers' +import { JobQueueObserversBuilder, NodeJSObserversBuilder, StatsObserversBuilder } from './metric-helpers' class OpenTelemetryMetrics { @@ -44,40 +43,16 @@ class OpenTelemetryMetrics { this.meter = metrics.getMeter('default') - this.buildMemoryObserver() this.buildRequestObserver() - this.buildJobQueueObserver() - const statsObserverBuilder = new StatsObserverBuilder(this.meter) - statsObserverBuilder.buildObservers() - } + const nodeJSObserversBuilder = new NodeJSObserversBuilder(this.meter, provider) + nodeJSObserversBuilder.buildObservers() - private buildMemoryObserver () { - this.meter.createObservableGauge('nodejs_memory_usage_bytes', { - description: 'Memory' - }).addCallback(observableResult => { - const current = process.memoryUsage() - - observableResult.observe(current.heapTotal, { memoryType: 'heapTotal' }) - observableResult.observe(current.heapUsed, { memoryType: 'heapUsed' }) - observableResult.observe(current.arrayBuffers, { memoryType: 'arrayBuffers' }) - observableResult.observe(current.external, { memoryType: 'external' }) - observableResult.observe(current.rss, { memoryType: 'rss' }) - }) - } + const jobQueueObserversBuilder = new JobQueueObserversBuilder(this.meter) + jobQueueObserversBuilder.buildObservers() - private buildJobQueueObserver () { - this.meter.createObservableGauge('peertube_job_queue_total', { - description: 'Total jobs in the PeerTube job queue' - }).addCallback(async observableResult => { - const stats = await JobQueue.Instance.getStats() - - for (const { jobType, counts } of stats) { - for (const state of Object.keys(counts)) { - observableResult.observe(counts[state], { jobType, state }) - } - } - }) + const statsObserversBuilder = new StatsObserversBuilder(this.meter) + statsObserversBuilder.buildObservers() } private buildRequestObserver () { -- cgit v1.2.3