# nexus_semantic_logger

Configures a [semantic_logger](https://rubygems.org/gems/rails_semantic_logger) as required for NexusMods components.

## Telemetry

As well as providing a semantic logger, this gem handles datadog telemetry associated with the logging approach:

* logs
* traces
* metrics
   * statsd is automatically attached to datadog runtime metrics and may also be used for custom metrics.

### Sending metrics

Ensure the metric name is in the format: `nexus.{component}.{major}.{minor}`

Where _major and minor_ are specific to the component logic e.g. `nexus.uploads.clamscan.pass`

For example, to increment a count:

```
NexusSemanticLogger.metrics.increment('nexus.users.registration.complete')
```

# Local gem development

Steps to run this gem from local sources in one the nexus 'staged build' rails components:

## Copy gem sources to component

```
cd ~/legacy/users
cp -r ../nexus_semantic_logger .
```

## Adjust component Dockerfile to include gem sources

Within stage 1, append a COPY after the Gemfile copy:

```
COPY --chown=nexus:nexus Gemfile* ./
COPY --chown=nexus:nexus nexus_semantic_logger/ ./nexus_semantic_logger/
```

Within stage 2, append a COPY after the bundle copy:

```
COPY --from=stage1 /usr/local/bundle /usr/local/bundle
COPY --from=stage1 /app/nexus_semantic_logger/ /app/nexus_semantic_logger/
```

## Adjust Gemfile to use local path

```
gem 'nexus_semantic_logger', :path => "/app/nexus_semantic_logger"