What steps are taken when a single microservice lacks resources?

When a microservice faces resource shortages, the following steps are usually taken:

1. Scaling — vertical (increasing resources on a single instance) or horizontal (adding new instances of the service).
2. Code and query optimization — performance analysis, eliminating bottlenecks.
3. Using queues and caching — to unload the service and reduce load.
4. Load distribution — balancing requests among instances.
5. Monitoring and alerting — setting up systems for timely detection of resource issues.

For example, in Kubernetes, you can increase the number of Deployment replicas to add more microservice instances and distribute the load.