DevOps Observability

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My name is Taras Sahaidachnyi and I'm a software engineer

Here on this page, you can find a lot of useful notes, cheat sheets, and infographics regarding DevOps Observability & Monitoring.

What is Observability, and how does it differ from Monitoring?

What are the Three Pillars of Observability?

How does OpenTelemetry work in Observability?

What is Prometheus, and how does it support monitoring?

Explain how Grafana integrates with Prometheus

What is tracing, and why is it important for observability?

How does Tempo support tracing?

What is a Histogram Metric, and how is it used in Prometheus?

Describe the purpose of the
otel-collector in OpenTelemetry

How does Grafana support alerting, and what are common use cases?

Explain how Service Level Objectives (SLOs) are implemented in Observability

What are RED metrics, and how do they relate to observability?

How does Prometheus handle High Cardinality Metrics?

What is the purpose of Labels in Prometheus metrics?

Explain the role of Exporters in Prometheus

What is the PromQL language in Prometheus?

Describe the Trace Context in OpenTelemetry

What are Service Dependencies, and how does tracing reveal them?

Explain the concept of span in distributed tracing

How does Grafana's Tempo differ from Jaeger for tracing?

What are Exemplars in Prometheus, and why are they useful?

How does OpenTelemetry handle Context Propagation?

What are Service Level Indicators (SLIs) and their importance in observability?

How does Prometheus scrape metrics from targets?

What is the role of Grafana Loki in observability?

Describe Push vs. Pull model
in metrics collection

What is Dynamic Service Discovery in Prometheus?

How do you troubleshoot high latency using distributed tracing?

What is the purpose of metrics aggregation in observability?

How do you prevent alert fatigue in monitoring?

Explain the remote_write and remote_read options in Prometheus

What are span tags, and how do they help in tracing?

How does Grafana's Tempo handle trace sampling?

What is tail-based sampling in distributed tracing?

How does metric retention work in Prometheus?

What are Prometheus recording rules?

How can you visualize traces in Grafana?

Describe counter vs. gauge metrics
in Prometheus

What are quantiles, and how are they calculated in Prometheus?

Explain how histogram_quantile() is used in Prometheus queries

What is a summary metric in Prometheus, and how does it differ from a histogram?

How does OpenTelemetry handle Sampling?

What is the purpose of
Grafana's Alertmanager?

Explain how distributed tracing helps detect microservice dependencies

How do you secure access to Prometheus metrics?

What is the purpose of Rate Limiting in Observability?

Explain the sum() function in Prometheus queries

What are Annotations in Grafana, and how are they used?

How do Labels affect Prometheus' storage usage?

What are traces and spans in OpenTelemetry?

What is histogram aggregation, and why is it important?

How does Grafana
handle Data Source Plugins?

Explain why Alert Thresholds are important in Observability

How does Prometheus handle
Metric Retention and Scaling?

What is the rate() function in PromQL?

How does OpenTelemetry support Multi-Language Instrumentation?

Explain how Synthetic Monitoring complements Observability

What is Correlation ID in Observability?

How do Labels in Prometheus enable Advanced Querying?

What is the purpose of the
otel-tracecontext format?

How does Grafana Loki differ from traditional log aggregation?

Describe a use case
for Prometheus increase() function

What is end-to-end latency, and how is it measured?

How do you manage high cardinality
in Prometheus?

How does the OpenTelemetry batching process work?

What are service maps, and how do they aid observability?

Explain how the Grafana transformations feature works.

What is tracing span context propagation?

How can you integrate OpenTelemetry with Prometheus?

What is canary monitoring,
and why is it used?

Explain the role of Service Discovery in Prometheus monitoring

How does OpenTelemetry
handle log aggregation?

What are exemplars, and how do they work with Prometheus?

Describe the Vector and Matrix data types in PromQL

How does Grafana handle data retention and storage?

How does Prometheus alert
on time-series data?

Explain client-side sampling in OpenTelemetry

What is histogram bucketing in Prometheus, and how does it work?

How does Grafana Tempo avoid indexing?

What is a Correlation Metric
in Observability?

How does the
OpenTelemetry Collector work?

What is a Service Level Objective (SLO), and why is it important?

Describe the function of
sum_over_time in PromQL

How can Grafana’s Alertmanager be configured to reduce alert noise?

What is tail-based sampling in OpenTelemetry, and when is it useful?

What are the benefits of using a Histogram vs. Summary in Prometheus?

Explain Distributed Tracing
Root Cause Analysis

How do you use Grafana’s Transform tab for data manipulation?

How does rate() differ from irate()
in PromQL?

How does Grafana’s Tempo handle trace queries?

What is Push-based Monitoring,
and how does it work with Prometheus?

What are the primary benefits of using OpenTelemetry over other
telemetry tools?

How does OpenTelemetry handle Context Propagation across services?

What is the Join Transformation in Grafana, and when is it used?

How do Exemplars help connect metrics and traces in Observability?

What is an SLI, and how does it differ from an SLO?

What is Vector Aggregation in PromQL, and how is it used?

Explain the purpose of Log Correlations in Observability

How does the OpenTelemetry SpanProcessor function?

What are time-to-resolution and mean-time-to-detect, and why are they important?

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