In the realm of DevOps observability, numerous "Open" projects, standards, and tools can be confusing due to their similar names and overlapping purposes. Key among these is OpenTelemetry, a unified set of vendor-agnostic APIs, SDKs, and tools for collecting telemetry data, which emerged from the merger of OpenTracing and OpenCensus and is now a Cloud Native Computing Foundation (CNCF) project. OpenTracing and OpenCensus were initial, separate efforts to create vendor-neutral APIs for distributed tracing and metrics collection, respectively, and have been integrated into OpenTelemetry. OpenMetrics aims to standardize cloud-native metrics transmission using Prometheus' wire format and is advancing towards CNCF incubation and IETF standardization. OpenSearch, developed as an open-source fork of Elasticsearch and Kibana, incorporates features from OpenDistro for Elasticsearch, after the latter's merger into OpenSearch. These projects illustrate the complexity and ongoing consolidation within the open-source observability domain, offering various tools and standards for data collection and analysis while highlighting the need for clarity amidst the proliferation of "Open" initiatives.