spencerwilson

Sampler survey

This doc compares the capabilities of popular telemetry sampling systems. The dimensions that are compared:

Dimensions related to limiting throughput

Temporal resolution: The time range that the limiting occurs on. E.g., limit the number of...

• Spans per second
• Spans per calendar month

Degree of limiting: In a steady state with spans created at a rate R span/s that is greater than the desired limit,

spencerwilson

Two kinds of samplers

Consider two broad goals in sampling:

• Avoid {over,under}sampling of data
• Ensure that overall data collection doesn't exceed acceptable limits

These can be treated separately. Doing so may yield a simpler and more flexible conceptual foundation for sampling.

Balancers

Define a balancer to be a sampler that does the following: For each input trace,

1. Assign a "frequency" score to the trace.

spencerwilson

import { Context, SpanAttributes } from '@opentelemetry/api';
import {
  ReadableSpan,
  Span,
  SpanProcessor,
} from '@opentelemetry/sdk-trace-base';

/**
 * Intercepts `onEnd` to modify a finished Span's attributes.
 * Otherwise delegates completely to a child SpanProcessor.

spencerwilson

# configuration file /etc/nginx/nginx.conf:
#Elastic Beanstalk Nginx Configuration File

load_module /home/ec2-user/otel_ngx_module.so;

user                    nginx;
error_log               /var/log/nginx/error.log warn;
pid                     /var/run/nginx.pid;
worker_processes        auto;
worker_rlimit_nofile    200000;

spencerwilson

#!/usr/bin/env python

import numpy as np
import pandas as pd
from sklearn import svm

FILE_NAME = 'mosteller-wallace-federalist-papers.csv'
STOP_WORDS = ['a', 'an']

# Rows are samples, cols are [...word_count, AUTHOR, CODE_NUMER].

spencerwilson

/**
 * @typedef Point
 * A pair of numbers suitable for plotting.
 */

/**
 * @param {Array.<number>} arr
 *        n observations of a continuous random variable (RV).
 * @returns {Array.<Point>}
 *        The empirical probabilities of the given observed values of the RV.