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-# OpenCensus Log4j 2 Log Correlation
-
-This subproject is currently experimental, so it may be redesigned or removed in the future.  It
-will remain experimental until we have a specification for a log correlation feature in
-[opencensus-specs](https://github.com/census-instrumentation/opencensus-specs/)
-(issue [#123](https://github.com/census-instrumentation/opencensus-specs/issues/123)).
-
-The `opencensus-contrib-log-correlation-log4j2` artifact provides a
-[Log4j 2](https://logging.apache.org/log4j/2.x/)
-[`ContextDataInjector`](https://logging.apache.org/log4j/2.x/manual/extending.html#Custom_ContextDataInjector)
-that automatically adds tracing data to the context of Log4j
-[`LogEvent`](https://logging.apache.org/log4j/2.x/log4j-core/apidocs/org/apache/logging/log4j/core/LogEvent.html)s.
-The class name is
-`OpenCensusTraceContextDataInjector`. `OpenCensusTraceContextDataInjector` adds the current trace
-ID, span ID, and sampling decision to each `LogEvent`, so that they can be accessed with
-[`LogEvent.getContextData()`](https://logging.apache.org/log4j/2.x/log4j-core/apidocs/org/apache/logging/log4j/core/LogEvent.html#getContextData())
-or included in a layout.
-
-See
-https://github.com/census-ecosystem/opencensus-experiments/tree/master/java/log_correlation/log4j2
-for a demo that uses this library to correlate logs and traces in Stackdriver.
-
-## Instructions
-
-### Add the dependencies to your project
-
-For Maven add to your `pom.xml`:
-```xml
-<dependencies>
-  <dependency>
-    <groupId>io.opencensus</groupId>
-    <artifactId>opencensus-contrib-log-correlation-log4j2</artifactId>
-    <version>0.16.1</version>
-    <scope>runtime</scope>
-  </dependency>
-</dependencies>
-```
-
-For Gradle add to your dependencies:
-```groovy
-runtime 'io.opencensus:opencensus-contrib-log-correlation-log4j2:0.16.1'
-```
-
-### Configure the `OpenCensusTraceContextDataInjector`
-
-#### Specify the `ContextDataInjector` override
-
-Override Log4j's default `ContextDataInjector` by setting the system property
-`log4j2.contextDataInjector` to the full name of the class,
-`io.opencensus.contrib.logcorrelation.log4j2.OpenCensusTraceContextDataInjector`.
-
-#### Choose when to add tracing data to log events
-
-The following system property controls the decision to add tracing data from the current span to a
-log event:
-
-`io.opencensus.contrib.logcorrelation.log4j2.OpenCensusTraceContextDataInjector.spanSelection`
-
-The allowed values are:
-
-* `ALL_SPANS`: adds tracing data to all log events (default)
-
-* `NO_SPANS`: disables the log correlation feature
-
-* `SAMPLED_SPANS`: adds tracing data to log events when the current span is sampled
-
-### Add the tracing data to log entries
-
-`opencensus-contrib-log-correlation-log4j2` adds the following key-value pairs to the `LogEvent`
-context:
-
-* `opencensusTraceId` - the lowercase base16 encoding of the current trace ID
-* `opencensusSpanId` - the lowercase base16 encoding of the current span ID
-* `opencensusTraceSampled` - the sampling decision of the current span ("true" or "false")
-
-These values can be accessed from layouts with
-[Context Map Lookup](http://logging.apache.org/log4j/2.x/manual/lookups.html#ContextMapLookup).  For
-example, the trace ID can be accessed with `$${ctx:opencensusTraceId}`.  The values can also be
-accessed with the `X` conversion character in
-[`PatternLayout`](http://logging.apache.org/log4j/2.x/manual/layouts.html#PatternLayout), for
-example, `%X{opencensusTraceId}`.
-
-See an example Log4j configuration file in the demo:
-https://github.com/census-ecosystem/opencensus-experiments/tree/master/java/log_correlation/log4j2/src/main/resources/log4j2.xml
-
-### Java Versions
-
-Java 6 or above is required for using this artifact.