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@ -116,7 +116,8 @@ func init() {
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// Log as JSON instead of the default ASCII formatter.
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log.SetFormatter(&log.JSONFormatter{})
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// Output to stdout instead of the default stderr, could also be a file.
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// Output to stdout instead of the default stderr
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// Can be any io.Writer, see below for File example
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log.SetOutput(os.Stdout)
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// Only log the warning severity or above.
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@ -167,7 +168,15 @@ var log = logrus.New()
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func main() {
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// The API for setting attributes is a little different than the package level
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// exported logger. See Godoc.
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log.Out = os.Stderr
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log.Out = os.Stdout
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// You could set this to any `io.Writer` such as a file
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// file, err := os.OpenFile("logrus.log", os.O_CREATE|os.O_WRONLY, 0666)
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// if err == nil {
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// log.Out = file
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// } else {
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// log.Info("Failed to log to file, using default stderr")
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// }
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log.WithFields(logrus.Fields{
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"animal": "walrus",
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@ -200,6 +209,20 @@ In general, with Logrus using any of the `printf`-family functions should be
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seen as a hint you should add a field, however, you can still use the
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`printf`-family functions with Logrus.
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#### Default Fields
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Often it's helpful to have fields _always_ attached to log statements in an
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application or parts of one. For example, you may want to always log the
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`request_id` and `user_ip` in the context of a request. Instead of writing
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`log.WithFields(log.Fields{"request_id": request_id, "user_ip": user_ip})` on
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every line, you can create a `logrus.Entry` to pass around instead:
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```go
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requestLogger := log.WithFields(log.Fields{"request_id": request_id, user_ip: user_ip})
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requestLogger.Info("something happened on that request") # will log request_id and user_ip
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requestLogger.Warn("something not great happened")
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```
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#### Hooks
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You can add hooks for logging levels. For example to send errors to an exception
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@ -235,42 +258,47 @@ Note: Syslog hook also support connecting to local syslog (Ex. "/dev/log" or "/v
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| Hook | Description |
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| ----- | ----------- |
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| [Airbrake](https://github.com/gemnasium/logrus-airbrake-hook) | Send errors to the Airbrake API V3. Uses the official [`gobrake`](https://github.com/airbrake/gobrake) behind the scenes. |
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| [Airbrake "legacy"](https://github.com/gemnasium/logrus-airbrake-legacy-hook) | Send errors to an exception tracking service compatible with the Airbrake API V2. Uses [`airbrake-go`](https://github.com/tobi/airbrake-go) behind the scenes. |
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| [Papertrail](https://github.com/polds/logrus-papertrail-hook) | Send errors to the [Papertrail](https://papertrailapp.com) hosted logging service via UDP. |
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| [Syslog](https://github.com/Sirupsen/logrus/blob/master/hooks/syslog/syslog.go) | Send errors to remote syslog server. Uses standard library `log/syslog` behind the scenes. |
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| [Bugsnag](https://github.com/Shopify/logrus-bugsnag/blob/master/bugsnag.go) | Send errors to the Bugsnag exception tracking service. |
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| [Sentry](https://github.com/evalphobia/logrus_sentry) | Send errors to the Sentry error logging and aggregation service. |
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| [Hiprus](https://github.com/nubo/hiprus) | Send errors to a channel in hipchat. |
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| [Logrusly](https://github.com/sebest/logrusly) | Send logs to [Loggly](https://www.loggly.com/) |
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| [Slackrus](https://github.com/johntdyer/slackrus) | Hook for Slack chat. |
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| [Journalhook](https://github.com/wercker/journalhook) | Hook for logging to `systemd-journald` |
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| [Graylog](https://github.com/gemnasium/logrus-graylog-hook) | Hook for logging to [Graylog](http://graylog2.org/) |
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| [Raygun](https://github.com/squirkle/logrus-raygun-hook) | Hook for logging to [Raygun.io](http://raygun.io/) |
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| [LFShook](https://github.com/rifflock/lfshook) | Hook for logging to the local filesystem |
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| [Honeybadger](https://github.com/agonzalezro/logrus_honeybadger) | Hook for sending exceptions to Honeybadger |
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| [Mail](https://github.com/zbindenren/logrus_mail) | Hook for sending exceptions via mail |
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| [Rollrus](https://github.com/heroku/rollrus) | Hook for sending errors to rollbar |
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| [Fluentd](https://github.com/evalphobia/logrus_fluent) | Hook for logging to fluentd |
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| [Mongodb](https://github.com/weekface/mgorus) | Hook for logging to mongodb |
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| [Influxus] (http://github.com/vlad-doru/influxus) | Hook for concurrently logging to [InfluxDB] (http://influxdata.com/) |
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| [InfluxDB](https://github.com/Abramovic/logrus_influxdb) | Hook for logging to influxdb |
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| [Octokit](https://github.com/dorajistyle/logrus-octokit-hook) | Hook for logging to github via octokit |
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| [DeferPanic](https://github.com/deferpanic/dp-logrus) | Hook for logging to DeferPanic |
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| [Redis-Hook](https://github.com/rogierlommers/logrus-redis-hook) | Hook for logging to a ELK stack (through Redis) |
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| [Airbrake](https://github.com/gemnasium/logrus-airbrake-hook) | Send errors to the Airbrake API V3. Uses the official [`gobrake`](https://github.com/airbrake/gobrake) behind the scenes. |
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| [Amazon Kinesis](https://github.com/evalphobia/logrus_kinesis) | Hook for logging to [Amazon Kinesis](https://aws.amazon.com/kinesis/) |
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| [Amqp-Hook](https://github.com/vladoatanasov/logrus_amqp) | Hook for logging to Amqp broker (Like RabbitMQ) |
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| [KafkaLogrus](https://github.com/goibibo/KafkaLogrus) | Hook for logging to kafka |
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| [Typetalk](https://github.com/dragon3/logrus-typetalk-hook) | Hook for logging to [Typetalk](https://www.typetalk.in/) |
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| [Bugsnag](https://github.com/Shopify/logrus-bugsnag/blob/master/bugsnag.go) | Send errors to the Bugsnag exception tracking service. |
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| [DeferPanic](https://github.com/deferpanic/dp-logrus) | Hook for logging to DeferPanic |
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| [ElasticSearch](https://github.com/sohlich/elogrus) | Hook for logging to ElasticSearch|
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| [Sumorus](https://github.com/doublefree/sumorus) | Hook for logging to [SumoLogic](https://www.sumologic.com/)|
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| [Scribe](https://github.com/sagar8192/logrus-scribe-hook) | Hook for logging to [Scribe](https://github.com/facebookarchive/scribe)|
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| [Logstash](https://github.com/bshuster-repo/logrus-logstash-hook) | Hook for logging to [Logstash](https://www.elastic.co/products/logstash) |
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| [logz.io](https://github.com/ripcurld00d/logrus-logzio-hook) | Hook for logging to [logz.io](https://logz.io), a Log as a Service using Logstash |
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| [Logmatic.io](https://github.com/logmatic/logmatic-go) | Hook for logging to [Logmatic.io](http://logmatic.io/) |
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| [Pushover](https://github.com/toorop/logrus_pushover) | Send error via [Pushover](https://pushover.net) |
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| [PostgreSQL](https://github.com/gemnasium/logrus-postgresql-hook) | Send logs to [PostgreSQL](http://postgresql.org) |
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| [Fluentd](https://github.com/evalphobia/logrus_fluent) | Hook for logging to fluentd |
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| [Go-Slack](https://github.com/multiplay/go-slack) | Hook for logging to [Slack](https://slack.com) |
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| [Graylog](https://github.com/gemnasium/logrus-graylog-hook) | Hook for logging to [Graylog](http://graylog2.org/) |
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| [Hiprus](https://github.com/nubo/hiprus) | Send errors to a channel in hipchat. |
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| [Honeybadger](https://github.com/agonzalezro/logrus_honeybadger) | Hook for sending exceptions to Honeybadger |
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| [InfluxDB](https://github.com/Abramovic/logrus_influxdb) | Hook for logging to influxdb |
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| [Influxus] (http://github.com/vlad-doru/influxus) | Hook for concurrently logging to [InfluxDB] (http://influxdata.com/) |
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| [Journalhook](https://github.com/wercker/journalhook) | Hook for logging to `systemd-journald` |
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| [KafkaLogrus](https://github.com/goibibo/KafkaLogrus) | Hook for logging to kafka |
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| [LFShook](https://github.com/rifflock/lfshook) | Hook for logging to the local filesystem |
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| [Logentries](https://github.com/jcftang/logentriesrus) | Hook for logging to [Logentries](https://logentries.com/) |
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| [Logentrus](https://github.com/puddingfactory/logentrus) | Hook for logging to [Logentries](https://logentries.com/) |
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| [Logmatic.io](https://github.com/logmatic/logmatic-go) | Hook for logging to [Logmatic.io](http://logmatic.io/) |
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| [Logrusly](https://github.com/sebest/logrusly) | Send logs to [Loggly](https://www.loggly.com/) |
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| [Logstash](https://github.com/bshuster-repo/logrus-logstash-hook) | Hook for logging to [Logstash](https://www.elastic.co/products/logstash) |
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| [Mail](https://github.com/zbindenren/logrus_mail) | Hook for sending exceptions via mail |
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| [Mongodb](https://github.com/weekface/mgorus) | Hook for logging to mongodb |
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| [NATS-Hook](https://github.com/rybit/nats_logrus_hook) | Hook for logging to [NATS](https://nats.io) |
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| [Octokit](https://github.com/dorajistyle/logrus-octokit-hook) | Hook for logging to github via octokit |
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| [Papertrail](https://github.com/polds/logrus-papertrail-hook) | Send errors to the [Papertrail](https://papertrailapp.com) hosted logging service via UDP. |
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| [PostgreSQL](https://github.com/gemnasium/logrus-postgresql-hook) | Send logs to [PostgreSQL](http://postgresql.org) |
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| [Pushover](https://github.com/toorop/logrus_pushover) | Send error via [Pushover](https://pushover.net) |
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| [Raygun](https://github.com/squirkle/logrus-raygun-hook) | Hook for logging to [Raygun.io](http://raygun.io/) |
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| [Redis-Hook](https://github.com/rogierlommers/logrus-redis-hook) | Hook for logging to a ELK stack (through Redis) |
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| [Rollrus](https://github.com/heroku/rollrus) | Hook for sending errors to rollbar |
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| [Scribe](https://github.com/sagar8192/logrus-scribe-hook) | Hook for logging to [Scribe](https://github.com/facebookarchive/scribe)|
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| [Sentry](https://github.com/evalphobia/logrus_sentry) | Send errors to the Sentry error logging and aggregation service. |
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| [Slackrus](https://github.com/johntdyer/slackrus) | Hook for Slack chat. |
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| [Stackdriver](https://github.com/knq/sdhook) | Hook for logging to [Google Stackdriver](https://cloud.google.com/logging/) |
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| [Sumorus](https://github.com/doublefree/sumorus) | Hook for logging to [SumoLogic](https://www.sumologic.com/)|
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| [Syslog](https://github.com/Sirupsen/logrus/blob/master/hooks/syslog/syslog.go) | Send errors to remote syslog server. Uses standard library `log/syslog` behind the scenes. |
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| [TraceView](https://github.com/evalphobia/logrus_appneta) | Hook for logging to [AppNeta TraceView](https://www.appneta.com/products/traceview/) |
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| [Typetalk](https://github.com/dragon3/logrus-typetalk-hook) | Hook for logging to [Typetalk](https://www.typetalk.in/) |
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| [logz.io](https://github.com/ripcurld00d/logrus-logzio-hook) | Hook for logging to [logz.io](https://logz.io), a Log as a Service using Logstash |
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#### Level logging
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@ -346,8 +374,11 @@ The built-in logging formatters are:
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without colors.
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* *Note:* to force colored output when there is no TTY, set the `ForceColors`
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field to `true`. To force no colored output even if there is a TTY set the
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`DisableColors` field to `true`
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`DisableColors` field to `true`. For Windows, see
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[github.com/mattn/go-colorable](https://github.com/mattn/go-colorable).
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* All options are listed in the [generated docs](https://godoc.org/github.com/sirupsen/logrus#TextFormatter).
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* `logrus.JSONFormatter`. Logs fields as JSON.
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* All options are listed in the [generated docs](https://godoc.org/github.com/sirupsen/logrus#JSONFormatter).
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Third party logging formatters:
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@ -396,6 +427,18 @@ srv := http.Server{
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Each line written to that writer will be printed the usual way, using formatters
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and hooks. The level for those entries is `info`.
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This means that we can override the standard library logger easily:
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```go
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logger := logrus.New()
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logger.Formatter = &logrus.JSONFormatter{}
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// Use logrus for standard log output
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// Note that `log` here references stdlib's log
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// Not logrus imported under the name `log`.
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log.SetOutput(logger.Writer())
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```
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#### Rotation
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Log rotation is not provided with Logrus. Log rotation should be done by an
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