chore: add make target for e2e tests grafana (#2410)

Just to make troubleshooting easier when running the tests locally.

Makefile

@@ -337,6 +337,28 @@ dev-tests-setup: dev-tests-kind-cluster cli-build build-images load-to-kind
 dev-tests-setup-no-build: TAG := e2e-test
 dev-tests-setup-no-build: dev-tests-kind-cluster load-to-kind
 
+# When you run an e2e test locally, and want a grafana instance to troubleshoot the results
+# run this target to start grafana, then run dev-tests-grafana-port-forward to access it.
+.PHONY: dev-tests-grafana
+dev-tests-grafana:
+	@echo "Starting Grafana for troubleshooting e2e tests"
+	helm install -n traces grafana grafana/grafana \
+	--set "env.GF_AUTH_ANONYMOUS_ENABLED=true" \
+	--set "env.GF_AUTH_ANONYMOUS_ORG_ROLE=Admin" \
+	--set "datasources.datasources\.yaml.apiVersion=1" \
+	--set "datasources.datasources\.yaml.datasources[0].name=Tempo" \
+	--set "datasources.datasources\.yaml.datasources[0].type=tempo" \
+	--set "datasources.datasources\.yaml.datasources[0].url=http://e2e-tests-tempo:3100" \
+	--set "datasources.datasources\.yaml.datasources[0].access=proxy" \
+	--set "datasources.datasources\.yaml.datasources[0].isDefault=true"
+
+# For e2e local tests, run this target to port forward the Grafana instance to your local browser
+.PHONY: dev-tests-grafana-port-forward
+dev-tests-grafana-port-forward:
+	@echo "Port forwarding Grafana for troubleshooting e2e tests"
+	@echo "Visit http://localhost:3080/explore to access Grafana"
+	kubectl port-forward -n traces svc/grafana 3080:80
+
 # Use this for debug to add a destination which only prints samples of telemetry items to the cluster gateway collector logs
 .PHONY: dev-debug-destination
 dev-debug-destination:

tests/e2e/README.md

@@ -130,7 +130,24 @@ tests/e2e/common/traceql_runner.sh <path-to-yaml-file>
 
 When tests fail, and it's related to some traceql query not succeeding, it can be useful to setup a grafana ui to commit queries and see the traces that are stored in tempo.
 
-- Install grafana with helm:
+### TL;DR
+
+```bash
+make dev-tests-grafana
+make dev-tests-grafana-port-forward
+```
+
+Then browse to `http://localhost:3080/explore`.
+
+### Detailed Steps
+
+- Install grafana with helm once:
+
+```bash
+make dev-tests-grafana
+```
+
+or manually:
 
 ```bash
 helm install -n traces grafana grafana/grafana \
@@ -146,6 +163,12 @@ helm install -n traces grafana grafana/grafana \
 
 - Port forward to the grafana service:
 
+```bash
+make dev-tests-grafana-port-forward
+```
+
+or manually:
+
 ```bash
 kubectl port-forward svc/grafana 3080:80 -n traces
 ```