Telemetry signals

• 3 pillars of observability
• Metrics
• Logs
• Traces

Metrics

• Metrics are numeric representation of data measured over intervals of time
• A threshold is an objetive that should not be trespassed

• Ideally the current state must not reach the threshold

• 4 golden signals

• latency: time to serve a request
• traffic: requests/s
• error: error rate of requests

• saturation: fullness of a service

• Common metrics

• CPU, Memory, Disk Usage

Logging

• Log is a immutable, timestamped record of discrete events that happened over time

Tracing

• Trace is a representation of a series of causally related distributed events
• Shows the end-to-end request flow through a distributed system