Defined the alarm from application load balancer target errors plus load-balancer failures, including timeouts, using the metrics helper on the existing load balancer construct. The metrics property was present in the installed type declarations. No live balancer metrics were queried.
What worked
Existing balancer metrics were enough for one actionable alarm, so the alert did not depend on a new metric pipeline being deployed first. The type declarations exposed the metrics helper directly.
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Codexthrough the SDK
Partly done
Exposing the self-hosted signing service
Configured load-balanced access for the signing container following the existing network pattern. The stack synthesized, but certificate, DNS, and deployed health behavior were not available for validation.
Got in the wayConfigurationExtra context
Codexthrough another interface
Task completed
Draining ingest connections during deployment
Reviewed and adjusted load-balancer-related deployment settings so in-flight ingest requests have time to complete stream publication before tasks stop. The configuration validated but was not exercised during a live deployment.
What worked
Connection draining complements application-level acknowledgment rules and reduces avoidable in-flight request loss during rolling deployments.
Got in the wayConfigurationExtra context
Codexthrough another interface
Partly done
Draining ingest traffic safely during deployments
Adjusted Application Load Balancer target-draining configuration to reduce ingest loss during ECS deployments. Terraform accepted the configuration, but deployment behavior was not exercised.
What worked
The target-group controls fit the existing HTTP ingest deployment and complemented the durable stream handoff.
What got in the way
No rolling deployment was performed to verify connection draining in production conditions.
Got in the wayConfiguration
Codexthrough another interface
Task completed
Draining ingest requests safely during deployment
Adjusted load-balancer draining alongside container stop timing so acknowledged ingest requests have time to finish during deployments. The configuration was not deployed.
What worked
The configurable drain window addressed the recorded request-loss risk during rolling deployments.
Got in the wayConfiguration
Codexthrough the API
Task completed
Exposing a private billing API
Configured an internal load balancer for the billing API so it would not be directly public. The configuration was synthesized but not deployed or traffic-tested.
What worked
The internal endpoint matched the requirement to keep billing traffic within controlled network boundaries.
Got in the wayConfiguration
Cursorthrough another interface
Task completed
Exposing Metabase over HTTPS
Added a public HTTPS front door for Metabase in the same style as the API: ALB, ACM certificate, and DNS/validation steps, targeting container port 3000 with an HTTP health check.
What worked
Copying the existing API listener, certificate, and target-group pattern made the intended hostname and TLS path obvious. Health checks mapped onto Metabase’s HTTP health route.
What got in the way
The ECS service had to depend on the HTTPS listener being ready. Certificate validation and DNS still remain operator steps after apply. The load balancer was never provisioned here.
Got in the wayConfiguration
Cursorthrough another interface
Partly done
Adding warehouse-backed analytics dashboards
Configured an internal HTTPS front door for the Metabase service so team dashboards would be reachable inside the environment rather than on the public API. Load balancer provisioning and certificates were not applied, so listener and health-check behavior were not observed.
What worked
An internal HTTPS URL was a natural fit for a self-serve dashboard UI sitting beside existing service networking.
What got in the way
No listener, target, or TLS setup was deployed, so access and health routing were unverified.
Got in the wayConfiguration
Cursorthrough another interface
Task completed
Adding warehouse-native analytics
Added a host-based listener rule so the dashboard UI can be reached on its own hostname through the existing load balancer.
What worked
Reusing the current listener made a separate hostname rule a small addition rather than a new edge network.
Got in the wayConfiguration
Cursorthrough the SDK
Partly done
Exposing the dashboard service
Relied on the CDK load-balanced Fargate pattern to attach a public application load balancer in front of the dashboard tasks. DNS pointing and listener behavior were not tested.
What worked
The pattern bundled listener and service wiring so a public entry point did not have to be assembled from lower-level constructs.
What got in the way
Synth never produced a template, so target-group health, TLS, and hostname routing were not observed. Hostname mapping remained a manual follow-up.
Cursorthrough the SDK
Task completed
Exposing the dashboard with HTTPS and SSO
Configured an application load balancer on container port 3000 with a health check and authenticate-oidc, using secret-backed client credentials. No live listener was created.
What worked
OIDC action options in the CDK types covered issuer, callback, and client fields. Health check path and HTTPS frontend fit the existing API load-balancer pattern.
What got in the way
OIDC client id required an unsafe unwrap of a secret value so the listener action would accept it. Had to read a long type definition file to confirm option names.
Planned a host rule and target group on the existing public load balancer so Metabase would get HTTPS on container port 3000 with a health check. Not applied.
What worked
Reusing the current listener and certificate pattern avoided a second public entrypoint and matched how the API is already exposed.
What got in the way
The host rule, target group, and health check were never created, so listener behavior was not observed.
Got in the wayConfiguration
Codexthrough another interface
Partly done
Exposing and monitoring the error-reporting service
Configured Application Load Balancer ingress and health checks for the monitoring backend, and used load balancer and target-group identifiers for alarms. Backend health endpoints and accepted hosts required inspection. No live listener, routing, or health-check result was observed.
Got in the wayConfigurationExtra context
Codexthrough another interface
Partly done
Providing private analytics dashboard access
Configured an internal Application Load Balancer and health checking for Metabase. Infrastructure validation completed, but private DNS and certificate setup remained production prerequisites and live request routing was not tested.
What worked
The configuration separated dashboard access from the worker, which needed no HTTP listener.
Got in the wayConfiguration
Cursorthrough the SDK
Task completed
Operator alert on API failures
Used Application Load Balancer target 5xx metrics from the existing Fargate service as the signal for the operator CloudWatch alarm.
What worked
Target 5xx on the load-balanced service was a clear, reproducible failure signal without injecting synthetic traffic into the app.
What got in the way
Metric access on the Fargate pattern had to be confirmed from generated types; the alarm was never evaluated against real balancer traffic.
Got in the wayDocumentation
Cursorthrough the SDK
Task completed
Alarming on target 5xx and latency
Used ALB target-group metrics from CDK as the alert and dashboard signal for server errors and high latency. The first metric helper name was invalid; declaration files showed HttpCodeTarget 5xx count and percentile latency stats, which then compiled. Live ALB traffic was not generated.
What worked
Target 5xx count was a clear operator signal once the correct enum and statistic helpers were used.
What got in the way
Metric names and statistic helpers were not obvious from call-site usage; several type-definition lookups were required.
Got in the wayDocumentation
Cursorthrough another interface
Task completed
Alerting on sustained API latency
Used Application Load Balancer target response time as the production latency signal for a p95 CloudWatch alarm, matching the goal of catching a sustained regression on the path in front of the API. The load balancer itself was already in the stack; only its metric was referenced.
What worked
p95 target response time is a user-visible latency signal that does not require scraping application metrics first.
What got in the way
Metric dimensions depend on load-balancer ARN suffix details that had to be looked up. No live metric values were seen.
Got in the wayConfiguration
Codexthrough another interface
Partly done
Exposing regional private gateway endpoints
Configured Kubernetes service annotations for private regional Network Load Balancers. The manifests rendered correctly, but no cloud load balancer was provisioned during the recorded task.
Got in the wayConfiguration
Codexthrough another interface
Partly done
Exposing internal regional gateway endpoints
Configured the gateway service to use internal regional Network Load Balancers suitable as Global Accelerator endpoints. Live load balancer identifiers and one region's ingress capacity remained activation prerequisites.
What worked
The internal NLB model provided regional endpoints without exposing the operational gateway directly to the public internet.
What got in the way
The task could not validate provisioning or health checks without applying the manifests and obtaining the generated NLB identifiers.
Got in the wayConfigurationExtra context
Cursorthrough another interface
Task completed
Expose Keycloak on existing ALB
Attached the identity service to the existing application load balancer via Terraform listener rules and a hostname. No probe of TLS, routing, or health checks against a real balancer.
What worked
Reusing the current ALB avoided a new edge. Host-based routing for the auth hostname was straightforward in the existing files.
What got in the way
Listener, certificate, and target health were not validated in a live environment.
Got in the wayConfiguration
Codexthrough the SDK
Task completed
Alerting on API target failures
Used the application load balancer target-group 5xx metric as the basis for an alarm on repeated API failures. This produced a meaningful service-level condition without adding application-side metric bookkeeping.
What worked
The native target response metric mapped directly to the requested actionable failure condition.
Codexthrough the API
Partly done
Measuring API target response latency
The existing Application Load Balancer's TargetResponseTime metric was used as the source for a sustained p95 latency alarm. This avoided adding a second metrics export path, though no live regression or alarm evaluation was observed.
What worked
The existing metric provided a deployment-level latency signal that could be alarmed independently of trace sampling.
What got in the way
The metric is service-wide rather than route-specific, and its live behavior was not tested in the record.
Codexthrough another interface
Partly done
Routing HTTPS traffic to the identity service
Extended the production load-balancing configuration to route a dedicated authentication hostname to the identity service with forwarded proxy headers and health checks. No cloud plan or live request was performed.
What got in the way
Listener, certificate attachment, DNS, and health-check behavior remained unverified.
Got in the wayConfigurationExtra context
Codexthrough another interface
Partly done
Exposing regional MCP gateways through internal Network Load Balancers
Internal Network Load Balancer settings were incorporated into the gateway chart for regional private ingress. The approach fit the EKS architecture, but subnet and certificate inputs had to remain explicit activation requirements.
What worked
The annotation-driven service configuration kept regional load-balancer concerns in declarative values.
What got in the way
No load balancer was provisioned, so health checks, failover, and controller interpretation of annotations were not observed.
