element-call/config/otel_dev/README.md

# OpenTelemetry Collector for development

This directory contains a docker compose file that starts a jaeger all-in-one instance
with an in-memory database, along with a standalong OpenTelemetry collector that forwards
traces into the jaeger. Jaeger has a built-in OpenTelemetry collector, but it can't be
configured to send CORS headers so can't be used from a browser. This sets the config on
the collector to send CORS headers.

This also adds an nginx to add CORS headers to the jaeger query endpoint, such that it can
be used from webapps like stalk (https://deniz.co/stalk/). The CORS enabled endpoint is
exposed on port 16687. To use stalk, you should simply be able to navigate to it and add
http://127.0.0.1:16687/api as a data source.

(Yes, we could enable the OTLP collector in jaeger all-in-one and passed this through
the nginx to enable CORS too, rather than running a separate collector. There's no reason
it's done this way other than that I'd already set up the separate collector.)

Running `docker compose up` in this directory should be all you need.
Slightly evolved but not-yet-working OpenTelemetry More usefully, including docker config for starting a CORS enabled OTLP collector so we don't have to use zipkin. 2023-03-15 14:35:10 +00:00			`# OpenTelemetry Collector for development`

			`This directory contains a docker compose file that starts a jaeger all-in-one instance`
			`with an in-memory database, along with a standalong OpenTelemetry collector that forwards`
			`traces into the jaeger. Jaeger has a built-in OpenTelemetry collector, but it can't be`
			`configured to send CORS headers so can't be used from a browser. This sets the config on`
			`the collector to send CORS headers.`
Include the arguably-obvious command line 2023-03-15 14:38:17 +00:00
Add CORS to jaeger query endpoint and make spans nested Adds an nginx in front of the query endpoint so we can use stalk without faffing with browser extension to bypass CORS. Also make the spans correctly have the call membership span as parent, which they didn't because we hadn't set the span at the point we made the context. 2023-03-17 17:01:59 +00:00			`This also adds an nginx to add CORS headers to the jaeger query endpoint, such that it can`
			`be used from webapps like stalk (https://deniz.co/stalk/). The CORS enabled endpoint is`
			`exposed on port 16687. To use stalk, you should simply be able to navigate to it and add`
			`http://127.0.0.1:16687/api as a data source.`

			`(Yes, we could enable the OTLP collector in jaeger all-in-one and passed this through`
			`the nginx to enable CORS too, rather than running a separate collector. There's no reason`
			`it's done this way other than that I'd already set up the separate collector.)`

Include the arguably-obvious command line 2023-03-15 14:38:17 +00:00			Running `docker compose up` in this directory should be all you need.