-   So is PrometheusMonitoring system and time series database ★ 60.9K Monitoring Time series License: Apache-2.0Prometheus, a Cloud Native Computing Foundation project, is a systems and service monitoring system. It collects metrics from configured targets at given intervals, evaluates rule expressions, displays the results, and can trigger alerts when specified conditions are observed. 
-   So is GrafanaOpen and composable observability and data visualization platform ★ 70.5K Monitoring Observability License: AGPL-3.0Visualize metrics, logs, and traces from multiple sources like Prometheus, Loki, Elasticsearch, InfluxDB, Postgres and many more.  
-   So is SigNozOpenTelemetry observability platform with logs, traces and metrics ★ 24K Monitoring Observability License: MIT ExpatAll your logs, metrics, and traces in one place. Monitor your application, spot issues before they occur and troubleshoot downtime quickly with rich context. SigNoz is a cost-effective open-source alternative to Datadog and New Relic. 
Sure, Graphite is awesome.
But have you considered these open source alternatives?
They are free, self-hostable and community-driven.
Check by yourself: Prometheus , Grafana , SigNoz .