Open-source Prometheus is suitable for initial cloud-native monitoring, but may fall short as data expands and complexity increases, necessitating a more capable observability platform. Indications it's time to upgrade include difficulties in quickly finding monitoring data, loss of crucial data, needing to retain more data for extended periods, and soaring monitoring costs. Challenges include fragmented data across multiple Prometheus instances, non-HA default setup risking data loss, and inefficiencies in handling long-term data due to lack of downsampling and compression. A next-generation SaaS solution like Chronosphere offers efficiency, reliability, scalability, and cost control, optimizing PromQL-compatible data storage and querying across scalable cloud-native environments.

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