A tool to generate synthetic OpenTelemetry logs, metrics and traces.
Often synthetics are used to validate certain configurations, to ensure that that systems operate as expected. Operating OpenTelemetry Collectors is often a complex task, which entails tuning many facets such as Receivers, Proccessors and Exporters.
otelgen allows you to quickly validate these configurations using the OpenTelemetry Protocol Specification, which supports both OTLP/gRPC and OTLP/HTTP using the OTLP Receiver.
The following specifications are supported.
- Traces: Yes
- Metrics: Yes
- Counter
- Histogram
- UpDownCounter
- Logs: Not started yet
Installing otelgen is possible via several methods. It can be insatlled via brew, an binary downloaded from GitHub Releases, or running it as a distroless multi-arch docker image.
Install brew and then run:
brew install krzko/tap/otelgenDownload the latest version from the Releases page.
To see all the tags view the Packages page.
Rn the container via the following command:
docker run --rm ghcr.io/krzko/otelgen:latest -hRunning otelgen will generate this help:
NAME:
otelgen - A tool to generate synthetic OpenTelemetry logs, metrics and traces
USAGE:
otelgen [global options] command [command options] [arguments...]
VERSION:
v0.0.3
COMMANDS:
metrics, m Generate metrics
traces, t Generate traces
help, h Shows a list of commands or help for one command
GLOBAL OPTIONS:
--duration value, -d value duration in seconds (default: 0)
--header value additional headers in 'key=value' format (accepts multiple inputs)
--help, -h show help (default: false)
--insecure, -i whether to enable client transport security (default: false)
--log-level value log level used by the logger, one of: debug, info, warn, error (default: "info")
--otel-exporter-otlp-endpoint value target URL to exporter endpoint
--protocol value, -p value the transport protocol, one of: grpc, http (default: "grpc")
--rate value, -r value rate in seconds (default: 5)
--service-name value, -s value service name to use (default: "otelgen")
--version, -v print the version (default: false)The otelgen metrics command supports many different metric types. Here is an example of how to generate metrics:
$ otelgen --otel-exporter-otlp-endpoint otelcol.foo.bar:443 metrics counter
{"level":"info","ts":1658746679.286242,"caller":"cli/metrics_counter.go:70","msg":"starting gRPC exporter"}
{"level":"info","ts":1658746679.46613,"caller":"cli/metrics_counter.go:87","msg":"Starting metrics generation"}
{"level":"info","ts":1658746679.466242,"caller":"metrics/config.go:59","msg":"generation of metrics is limited","per-second":5}
{"level":"info","ts":1658746679.467317,"caller":"metrics/metrics.go:47","msg":"generating","name":"otelgen.metrics.counter"}
{"level":"info","ts":1658746684.4677298,"caller":"metrics/metrics.go:47","msg":"generating","name":"otelgen.metrics.counter"}
...Here is an example, of how to limit the duration in seconds of a generation process:
$ otelgen --otel-exporter-otlp-endpoint otelcol.foo.bar:443 --duration 30 metrics counter
{"level":"info","ts":1658746721.598725,"caller":"cli/metrics_counter.go:70","msg":"starting gRPC exporter"}
{"level":"info","ts":1658746721.789262,"caller":"cli/metrics_counter.go:87","msg":"Starting metrics generation"}
{"level":"info","ts":1658746721.789321,"caller":"metrics/config.go:59","msg":"generation of metrics is limited","per-second":5}
{"level":"info","ts":1658746721.7894,"caller":"metrics/metrics.go:30","msg":"generation duration","seconds":30}
{"level":"info","ts":1658746721.789411,"caller":"metrics/metrics.go:40","msg":"generating","name":"otelgen.metrics.counter"}
{"level":"info","ts":1658746726.7905679,"caller":"metrics/metrics.go:40","msg":"generating","name":"otelgen.metrics.counter"}
{"level":"info","ts":1658746731.790965,"caller":"metrics/metrics.go:40","msg":"generating","name":"otelgen.metrics.counter"}
{"level":"info","ts":1658746736.791102,"caller":"metrics/metrics.go:40","msg":"generating","name":"otelgen.metrics.counter"}
{"level":"info","ts":1658746741.791389,"caller":"metrics/metrics.go:40","msg":"generating","name":"otelgen.metrics.counter"}
{"level":"info","ts":1658746746.791574,"caller":"metrics/metrics.go:40","msg":"generating","name":"otelgen.metrics.counter"}
{"level":"info","ts":1658746751.791806,"caller":"cli/metrics_counter.go:79","msg":"stopping the exporter"}If you need to pass in additional HTTP headers to allow for authentication to vendor backends, simply utilise the --header key=value flag. The unit is a slice of headers so it accepts multiple headers during invocation. Such as:
$ otelgen --otel-exporter-otlp-endpoint api.vendor.xyz:443 \
--header 'x-auth=xxxxxx' \
--header 'x-dataset=xxxxxx' \
metrics counterThe otelgen traces command supports two types of traces, single and multi, the difference being, sometimes you just want to send a single trace to validate a configuration. Multi will allow you configure the duration and rate.
Here is an example, of how to generate a trace using single, with using secure transport:
$ otelgen --otel-exporter-otlp-endpoint otelcol.foo.bar:443 traces single
{"level":"info","ts":1658747062.525185,"caller":"cli/traces.go:90","msg":"starting gRPC exporter"}
{"level":"info","ts":1658747062.710507,"caller":"traces/config.go:58","msg":"generation of traces isn't being throttled"}
{"level":"info","ts":1658747062.7106712,"caller":"traces/traces.go:43","msg":"starting traces","worker":0}
{"level":"info","ts":1658747062.710735,"caller":"traces/traces.go:79","msg":"Trace","worker":0,"traceId":"9481f4c1a9099079c49ed14af2739b6d"}
{"level":"info","ts":1658747062.710753,"caller":"traces/traces.go:80","msg":"Parent Span","worker":0,"spanId":"fd76b9e4265aecfc"}
{"level":"info","ts":1658747062.7107708,"caller":"traces/traces.go:81","msg":"Child Span","worker":0,"spanId":"02267d8d1342d63a"}
{"level":"info","ts":1658747062.710814,"caller":"traces/traces.go:92","msg":"traces generated","worker":0,"traces":2}
{"level":"info","ts":1658747062.710835,"caller":"cli/traces.go:108","msg":"stop the batch span processor"}
{"level":"info","ts":1658747062.742642,"caller":"cli/traces.go:99","msg":"stopping the exporter"}If you're running a collector on localhost, use --insecure to enable h2c for OTLP/gRPC (4317/tcp) and http for OTLP/HTTP (4318/tcp), of how to generate a trace using single, with using insecure transport:
$ otelgen --otel-exporter-otlp-endpoint localhost:4317 --insecure traces singleHere is an example, of how to generate a trace using multi, also, run -h to view the default values for each flag:
$ otelgen --otel-exporter-otlp-endpoint otelcol.foo.bar:443 --duration 10 --rate 1 traces multi
{"level":"info","ts":1658747148.7179039,"caller":"cli/traces.go:203","msg":"starting gRPC exporter"}
{"level":"info","ts":1658747148.908546,"caller":"traces/config.go:60","msg":"generation of traces is limited","per-second":1}
{"level":"info","ts":1658747148.908957,"caller":"traces/config.go:81","msg":"generation duration","seconds":10}
{"level":"info","ts":1658747148.910296,"caller":"traces/traces.go:43","msg":"starting traces","worker":0}
{"level":"info","ts":1658747148.91046,"caller":"traces/traces.go:79","msg":"Trace","worker":0,"traceId":"e299fc2461e04ee3c97d4f59e9b5f67a"}
{"level":"info","ts":1658747148.910481,"caller":"traces/traces.go:80","msg":"Parent Span","worker":0,"spanId":"0cefe413f4f5559a"}
{"level":"info","ts":1658747148.910497,"caller":"traces/traces.go:81","msg":"Child Span","worker":0,"spanId":"0ff83ff196aa83de"}
{"level":"info","ts":1658747148.91053,"caller":"traces/traces.go:43","msg":"starting traces","worker":0}
{"level":"info","ts":1658747149.9106922,"caller":"traces/traces.go:79","msg":"Trace","worker":0,"traceId":"9161121ffb377ef3e7b1d1efdb88c5d3"}
{"level":"info","ts":1658747149.910769,"caller":"traces/traces.go:80","msg":"Parent Span","worker":0,"spanId":"0aab1b9d6535bb84"}
{"level":"info","ts":1658747149.910798,"caller":"traces/traces.go:81","msg":"Child Span","worker":0,"spanId":"665b66edc4c7e26e"}
...If you need to pass in additional HTTP headers to allow for authentication to vendor backends, simply utilise the --header key=value flag. The unit is a slice of headers so it accepts multiple headers during invocation. Such as:
$ otelgen --otel-exporter-otlp-endpoint api.vendor.xyz:443 \
--header 'x-auth=xxxxxx' \
--header 'x-dataset=xxxxxx' \
traces singleThis tool was developed in a short amount of time due to the awesome idea of the following sources:
- tracegen: This utility simulates a client generating traces, useful for testing and demonstration purposes. In essence,
otelgenusestracegenas the tracing infrastructure.
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