Remove etcd alerts

These alerts will be vendored in the future through jsonnet-bundler
directly from the etcd repository.

assets/prometheus/rules/etcd3.rules.yaml

-groups:
-- name: ./etcd3.rules
-  rules:
-  - alert: InsufficientMembers
-    expr: count(up{job="etcd"} == 0) > (count(up{job="etcd"}) / 2 - 1)
-    for: 3m
-    labels:
-      severity: critical
-    annotations:
-      description: If one more etcd member goes down the cluster will be unavailable
-      summary: etcd cluster insufficient members
-  - alert: NoLeader
-    expr: etcd_server_has_leader{job="etcd"} == 0
-    for: 1m
-    labels:
-      severity: critical
-    annotations:
-      description: etcd member {{ $labels.instance }} has no leader
-      summary: etcd member has no leader
-  - alert: HighNumberOfLeaderChanges
-    expr: increase(etcd_server_leader_changes_seen_total{job="etcd"}[1h]) > 3
-    labels:
-      severity: warning
-    annotations:
-      description: etcd instance {{ $labels.instance }} has seen {{ $value }} leader
-        changes within the last hour
-      summary: a high number of leader changes within the etcd cluster are happening
-  - alert: HighNumberOfFailedGRPCRequests
-    expr: sum(rate(grpc_server_handled_total{grpc_code!="OK",job="etcd"}[5m])) BY (grpc_service, grpc_method)
-      / sum(rate(grpc_server_handled_total{job="etcd"}[5m])) BY (grpc_service, grpc_method) > 0.01
-    for: 10m
-    labels:
-      severity: warning
-    annotations:
-      description: '{{ $value }}% of requests for {{ $labels.grpc_method }} failed
-        on etcd instance {{ $labels.instance }}'
-      summary: a high number of gRPC requests are failing
-  - alert: HighNumberOfFailedGRPCRequests
-    expr: sum(rate(grpc_server_handled_total{grpc_code!="OK",job="etcd"}[5m])) BY (grpc_service, grpc_method)
-      / sum(rate(grpc_server_handled_total{job="etcd"}[5m])) BY (grpc_service, grpc_method) > 0.05
-    for: 5m
-    labels:
-      severity: critical
-    annotations:
-      description: '{{ $value }}% of requests for {{ $labels.grpc_method }} failed
-        on etcd instance {{ $labels.instance }}'
-      summary: a high number of gRPC requests are failing
-  - alert: GRPCRequestsSlow
-    expr: histogram_quantile(0.99, sum(rate(grpc_server_handling_seconds_bucket{job="etcd",grpc_type="unary"}[5m])) by (grpc_service, grpc_method, le))
-      > 0.15
-    for: 10m
-    labels:
-      severity: critical
-    annotations:
-      description: on etcd instance {{ $labels.instance }} gRPC requests to {{ $labels.grpc_method
-        }} are slow
-      summary: slow gRPC requests
-  - alert: HighNumberOfFailedHTTPRequests
-    expr: sum(rate(etcd_http_failed_total{job="etcd"}[5m])) BY (method) / sum(rate(etcd_http_received_total{job="etcd"}[5m]))
-      BY (method) > 0.01
-    for: 10m
-    labels:
-      severity: warning
-    annotations:
-      description: '{{ $value }}% of requests for {{ $labels.method }} failed on etcd
-        instance {{ $labels.instance }}'
-      summary: a high number of HTTP requests are failing
-  - alert: HighNumberOfFailedHTTPRequests
-    expr: sum(rate(etcd_http_failed_total{job="etcd"}[5m])) BY (method) / sum(rate(etcd_http_received_total{job="etcd"}[5m]))
-      BY (method) > 0.05
-    for: 5m
-    labels:
-      severity: critical
-    annotations:
-      description: '{{ $value }}% of requests for {{ $labels.method }} failed on etcd
-        instance {{ $labels.instance }}'
-      summary: a high number of HTTP requests are failing
-  - alert: HTTPRequestsSlow
-    expr: histogram_quantile(0.99, rate(etcd_http_successful_duration_seconds_bucket[5m]))
-      > 0.15
-    for: 10m
-    labels:
-      severity: warning
-    annotations:
-      description: on etcd instance {{ $labels.instance }} HTTP requests to {{ $labels.method
-        }} are slow
-      summary: slow HTTP requests
-  - alert: EtcdMemberCommunicationSlow
-    expr: histogram_quantile(0.99, rate(etcd_network_peer_round_trip_time_seconds_bucket[5m]))
-      > 0.15
-    for: 10m
-    labels:
-      severity: warning
-    annotations:
-      description: etcd instance {{ $labels.instance }} member communication with
-        {{ $labels.To }} is slow
-      summary: etcd member communication is slow
-  - alert: HighNumberOfFailedProposals
-    expr: increase(etcd_server_proposals_failed_total{job="etcd"}[1h]) > 5
-    labels:
-      severity: warning
-    annotations:
-      description: etcd instance {{ $labels.instance }} has seen {{ $value }} proposal
-        failures within the last hour
-      summary: a high number of proposals within the etcd cluster are failing
-  - alert: HighFsyncDurations
-    expr: histogram_quantile(0.99, rate(etcd_disk_wal_fsync_duration_seconds_bucket[5m]))
-      > 0.5
-    for: 10m
-    labels:
-      severity: warning
-    annotations:
-      description: etcd instance {{ $labels.instance }} fync durations are high
-      summary: high fsync durations
-  - alert: HighCommitDurations
-    expr: histogram_quantile(0.99, rate(etcd_disk_backend_commit_duration_seconds_bucket[5m]))
-      > 0.25
-    for: 10m
-    labels:
-      severity: warning
-    annotations:
-      description: etcd instance {{ $labels.instance }} commit durations are high
-      summary: high commit durations