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content/en/docs/concepts/instrumentation/zero-code/_index.md

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+---
+title: Zero-code
+description: >-
+  Learn how to add observability to an application without the need to write
+  code
+weight: 10
+aliases: [automatic]
+---
+
+As [ops](/docs/getting-started/ops/) you might want to add observability to one
+or more applications without having to edit the source. OpenTelemetry lets you
+quickly gain some observability for a service without having to use the
+OpenTelemetry API & SDK for
+[code-based instrumentation](/docs/concepts/instrumentation/code-based).
+
+![Zero Code](./zero-code.svg)
+
+Zero-code instrumentation adds the OpenTelemetry API and SDK capabilities to
+your application typically as an agent or agent-like installation. The specific
+mechanisms involved may differ by language, ranging from bytecode manipulation,
+monkey patching, or eBPF to inject calls to the OpenTelemetry API and SDK into
+your application.
+
+Typically, zero-code instrumentation adds instrumentation for the libraries
+you're using. This means that requests and responses, database calls, message
+queue calls, and so forth are what are instrumented. Your application's code,
+however, is not typically instrumented. To instrument your code, you'll need to
+use [code-based instrumentation](/docs/concepts/instrumentation/code-based).
+
+Additionally, zero-code instrumentation lets you configure the
+[Instrumentation Libraries](/docs/concepts/instrumentation/libraries) and
+[exporters](/docs/concepts/components/#exporters) loaded.
+
+You can configure zero-code instrumentation through environment variables and
+other language-specific mechanisms, such as system properties or arguments
+passed to initialization methods. To get started, you only need a service name
+configured so that you can identify the service in the observability backend of
+your choice.
+
+Other configuration options are available, including:
+
+- Data source specific configuration
+- Exporter configuration
+- Propagator configuration
+- Resource configuration
+
+Automatic instrumentation is available for the following languages:
+
+- [.NET](/docs/zero-code/net/)
+- [Go](/docs/zero-code/go)
+- [Java](/docs/zero-code/java/)
+- [JavaScript](/docs/zero-code/js/)
+- [PHP](/docs/zero-code/php/)
+- [Python](/docs/zero-code/python/)