Y26-035 - Add health endpoints to applications

[StephenHulme]

Describe the Housekeeping
Each app should have a minimal /health endpoint for basic service monitoring.
This has three main benefits:

• It's easy to distinguish monitoring requests from user requests in logs
• Monitoring requests response as fast as possible, to reduce overall load
• Monitoring requests specifically don't use external resources that might be stipulated in the application controller

Blocking issues
None

Additional context
This has already been successfully implemented in Limber - sanger/limber#2331

Here is the existing list of monitored endpoints - the Nagios check_http plugin is used to perform the checks, more details of the command arguments can be found on man page. The default path to check is /.

Host name	Service description	Check command	Health Endpoint PR
asset-audits.psd.sanger.ac.uk	HTTPS Asset Audits
baracoda.psd.sanger.ac.uk	HTTPS Baracoda	-u /health
cgap.psd.sanger.ac.uk	HTTPS CGAP LIMS	-u /cgap/
gatekeeper.psd.sanger.ac.uk	HTTPS Gatekeeper		sanger/gatekeeper#654
kibana.psd.sanger.ac.uk	HTTPS Kibana
labwhere.psd.sanger.ac.uk	HTTPS LabWhere	-s 'LabWhere'	sanger/labwhere#1069
lighthouse.psd.sanger.ac.uk	HTTPS Lighthouse Service	-u /health
limber.psd.sanger.ac.uk	HTTPS Limber	-u /health	sanger/limber#2331
mixtio.psd.sanger.ac.uk	HTTPS Mixtio
monit.psd.sanger.ac.uk	HTTPS Monit	-u /index.csp
portainer.psd.sanger.ac.uk	HTTPS Portainer
portainer.tol.psd.sanger.ac.uk	HTTPS TOL Portainer	-u /timeout.html#!/auth
print-my-barcode.psd.sanger.ac.uk	HTTPS Print-My- Barcode	-u /v1	sanger/print_my_barcode#571
quanthub.psd.sanger.ac.uk	HTTPS QuantHub
rabbitmq.tol.psd.sanger.ac.uk	HTTPS Tol RabbitMQ
redpanda.psd.sanger.ac.uk	HTTPS Redpanda Service	-u /subjects
redpanda.psd.sanger.ac.uk	HTTPS Redpanda UI	-u /console
sequencescape.psd.sanger.ac.uk	HTTPS SequenceScape FCE	-u /login -s 'Username'	sanger/sequencescape#5550
sm-workflow.psd.sanger.ac.uk	HTTPS SM-Workflow MiniLIMS
sprint.psd.sanger.ac.uk	HTTPS SPrint
sss0-prod.psd.sanger.ac.uk	HTTPS Seqscape SSS0-RMQ	-u /#
sss1-prod.psd.sanger.ac.uk	HTTPS Seqscape SSS1-RMQ	-u /#
ssw0-prod.psd.sanger.ac.uk	HTTPS Seqscape-Worker SSW0-RMQ	-u /#
stan.psd.sanger.ac.uk	HTTPS Stan-Spatial Genomics
storelight.psd.sanger.ac.uk	HTTPS Storelight	-u /graphiql/
traction.psd.sanger.ac.uk	HTTPS Traction RabbitMQ
traction.psd.sanger.ac.uk	HTTPS Traction Service	-u /v1/printers	sanger/traction-service#1795
traction.psd.sanger.ac.uk	HTTPS Traction UI
uat.limber.psd.sanger.ac.uk	HTTPS UAT Limber	-u /health
ware-prod.psd.sanger.ac.uk	HTTPS Warehouse RMQ