• [CHANGE] Remove deprecated flags --config-reloader-memory and --config-reloader-cpu in favor of --config-reloader-memory-limit, --config-reloader-memory-request, --config-reloader-cpu-limit, and --config-reloader-cpu-request. #3884
• [CHANGE] Remove use of Kubernetes API versions being removed in v1.22. #4171
• [FEATURE] Added support for OAuth2 authentication in remote read and remote write configuration. #4113
• [FEATURE] Added OAuth2 configuration for ServiceMonitor, PodMonitor and Probe. #4170
• [FEATURE] Added prometheus_operator_spec_shards metric for exposing the number of shards set on prometheus operator spec. #4173
• [FEATURE] Support for Authorization section in various prometheus sections. #4180
• [FEATURE] Validate prometheus rules when generating rule file content. #4184
• [FEATURE] Support label_limit, label_name_length_limit and label_value_length_limit configuration fields at the Prometheus CRD level as well as support individual limits per ServiceMonitor, PodMonitor and Probe resources. #4195
• [FEATURE] Added sample and target limits to Probe. #4207
• [FEATURE] Added send_exemplars field to the remote_write configuration in Prometheus. #4215 #4160
• [ENHANCEMENT] Support loading ClusterConfig from concatenated KUBECONFIG env. #4154
• [ENHANCEMENT] Include PrometheusRule in prometheus-operator CRD category. #4213
• [ENHANCEMENT] Preserve annotations set by kubectl. #4185
• [BUGFIX] Thanos: listen to all available IP addresses instead of POD_IP, simplifies istio management. #4038
• [BUGFIX] Add port name mapping to ConfigReloader to avoid reloader-web probe failure. #4187
• [BUGFIX] Handle Thanos rules partial_response_strategy field in validating admission webhook. #4217