The Telco ecosystem transformation towards cloud-native network services enables constructing an integrative platform business model in the form of a Multi-Sided Platform (MSP) leveraging microservice-based Virtualized Network Function architecture. In particular, MSP based architectures enable a multi-organizational ecosystem with increased automation possibilities for carriergrade services creation and operations. We present a microservice-based monitoring system for virtualized Telco services based on OpenAirInterface (OAI) with an SQL-like query manager for metrics. We demonstrate two monitoring scenarios: (1) Average receiving (rx) PDU in bytes at MAC layer from the targeted user equipment (UE). (2) Finding the UE who consumes the most Physical Resource Blocks (PRB) within a specific time interval for the uplink and downlink transmission.