.. Copyright 2012 New Dream Network (DreamHost) Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. .. _measurements: ============== Measurements ============== Three type of meters are defined in ceilometer: .. index:: double: meter; cumulative double: meter; gauge double: meter; delta ========== ============================================================================== Type Definition ========== ============================================================================== Cumulative Increasing over time (instance hours) Gauge Discrete items (floating IPs, image uploads) and fluctuating values (disk I/O) Delta Changing over time (bandwidth) ========== ============================================================================== Units ===== 1. Whenever a volume is to be measured, SI approved units and their approved symbols or abbreviations should be used. Information units should be expressed in bits ('b') or bytes ('B'). 2. For a given meter, the units should NEVER, EVER be changed. 3. When the measurement does not represent a volume, the unit description should always described WHAT is measured (ie: apples, disk, routers, floating IPs, etc.). 4. When creating a new meter, if another meter exists measuring something similar, the same units and precision should be used. 5. Meters and samples should always document their units in Ceilometer (API and Documentation) and new sampling code should not be merged without the appropriate documentation. ============ ======== ============== ===== Dimension Unit Abbreviations Note ============ ======== ============== ===== None N/A Dimension-less variable Volume byte B Time seconds s ============ ======== ============== ===== Here are the meter types by components that are currently implemented: Compute (Nova) ============== All meters are related to the guest machine, not the host. ======================== ========== ======== ======== ============ ======================================================= Name Type Unit Resource Origin Note ======================== ========== ======== ======== ============ ======================================================= instance Gauge instance inst ID both Duration of instance instance: Gauge instance inst ID both Duration of instance (openstack types) memory Gauge MB inst ID notification Volume of RAM in MB cpu Cumulative ns inst ID pollster CPU time used cpu_util Gauge % inst ID pollster Average CPU utilisation vcpus Gauge vcpu inst ID notification Number of VCPUs disk.read.requests Cumulative request inst ID pollster Number of read requests disk.write.requests Cumulative request inst ID pollster Number of write requests disk.read.bytes Cumulative B inst ID pollster Volume of read in B disk.write.bytes Cumulative B inst ID pollster Volume of write in B disk.root.size Gauge GB inst ID notification Size of root disk in GB disk.ephemeral.size Gauge GB inst ID notification Size of ephemeral disk in GB network.incoming.bytes Cumulative B iface ID pollster number of incoming bytes on the network for a VM interface network.outgoing.bytes Cumulative B iface ID pollster number of outgoing bytes on the network for a VM interface network.incoming.packets Cumulative packet iface ID pollster number of incoming packets for a VM interface network.outgoing.packets Cumulative packet iface ID pollster number of outgoing packets for a VM interface ======================== ========== ======== ======== ============ ======================================================= At present, most of the Nova meters will only work with libvirt front-end hypervisors while test coverage was mostly done based on KVM. Contributors are welcome to implement other virtualization backends’ meters or complete the existing ones. Network (Neutron) ================= ======================== ========== ======== ======== ============ ====================================================== Name Type Unit Resource Origin Note ======================== ========== ======== ======== ============ ====================================================== network Gauge network netw ID notification Duration of network network.create Delta network netw ID notification Creation requests for this network network.update Delta network netw ID notification Update requests for this network subnet Gauge subnet subnt ID notification Duration of subnet subnet.create Delta subnet subnt ID notification Creation requests for this subnet subnet.update Delta subnet subnt ID notification Update requests for this subnet port Gauge port port ID notification Duration of port port.create Delta port port ID notification Creation requests for this port port.update Delta port port ID notification Update requests for this port router Gauge router rtr ID notification Duration of router router.create Delta router rtr ID notification Creation requests for this router router.update Delta router rtr ID notification Update requests for this router ip.floating Gauge ip ip ID both Duration of floating ip ip.floating.create Delta ip ip ID notification Creation requests for this floating ip ip.floating.update Delta ip ip ID notification Update requests for this floating ip ======================== ========== ======== ======== ============ ====================================================== Image (Glance) ============== ======================== ========== ======= ======== ============ ======================================================= Name Type Unit Resource Origin Note ======================== ========== ======= ======== ============ ======================================================= image Gauge image image ID both Image polling -> it (still) exists image.size Gauge B image ID both Uploaded image size image.update Delta image image ID notification Number of update on the image image.upload Delta image image ID notification Number of upload of the image image.delete Delta image image ID notification Number of delete on the image image.download Delta B image ID notification Image is downloaded image.serve Delta B image ID notification Image is served out ======================== ========== ======= ======== ============ ======================================================= Volume (Cinder) =============== ======================== ========== ======= ======== ============ ======================================================= Name Type Unit Resource Origin Note ======================== ========== ======= ======== ============ ======================================================= volume Gauge volume vol ID notification Duration of volume volume.size Gauge GB vol ID notification Size of volume ======================== ========== ======= ======== ============ ======================================================= Make sure Cinder is properly configured first: see :ref:`installing_manually`. Object Storage (Swift) ====================== =============================== ========== ========== =========== ============ ========================================== Name Type Volume Resource Origin Note =============================== ========== ========== =========== ============ ========================================== storage.objects Gauge object store ID pollster Number of objects storage.objects.size Gauge B store ID pollster Total size of stored objects storage.objects.containers Gauge container store ID pollster Number of containers storage.objects.incoming.bytes Delta B store ID notification Number of incoming bytes storage.objects.outgoing.bytes Delta B store ID notification Number of outgoing bytes storage.api.request Delta request store ID notification Number of API requests against swift storage.containers.objects Gauge object str ID/cont pollster Number of objects in container storage.containers.objects.size Gauge B str ID/cont pollster Total size of stored objects in container =============================== ========== ========== =========== ============ ========================================== In order to use storage.objects.incoming.bytes and storage.outgoing.bytes, one must configure Swift as described in :ref:`installing_manually`. Note that they may not be updated right after an upload/download, since Swift takes some time to update the container properties. Energy (Kwapi) ============== ========================== ========== ========== ======== ========= ============================================== Name Type Volume Resource Origin Note ========================== ========== ========== ======== ========= ============================================== energy Cumulative kWh probe ID pollster Amount of energy power Gauge W probe ID pollster Power consumption ========================== ========== ========== ======== ========= ============================================== Dynamically retrieving the Meters via ceilometer client ======================================================= To retrieve the available meters that can be queried given the actual resource instances available, use the ``meter-list`` command: :: $ ceilometer meter-list -s openstack +------------+-------+--------------------------------------+---------+----------------------------------+ | Name | Type | Resource ID | User ID | Project ID | +------------+-------+--------------------------------------+---------+----------------------------------+ | image | gauge | 09e84d97-8712-4dd2-bcce-45970b2430f7 | | 57cf6d93688e4d39bf2fe3d3c03eb326 | Naming convention ================= If you plan on adding meters, please follow the convention bellow: 1. Always use '.' as separator and go from least to most discriminant word. For example, do not use ephemeral_disk_size but disk.ephemeral.size 2. When a part of the name is a variable, it should always be at the end and start with a ':'. For example do not use .image but image:, where type is your variable name. 3. If you have any hesitation, come and ask in #openstack-ceilometer User-defined sample metadata for Nova ========================================= Users are allowed to add additional metadata to samples of nova meter. These additional metadata are stored in 'resource_metadata.user_metadata.*' of the sample To do so, users should add nova user metadata prefixed with 'metering.': :: $ nova boot --meta metering.custom_metadata=a_value my_vm Note: The name of the metadata shouldn't exceed 256 characters otherwise it will be cut off. Also, if it has '.', this will be replaced by a '_' in ceilometer. User-defined sample metadata for Swift ========================================== It's possible to add additional metadata to sample of Swift meter as well. You might specify headers whose values will be stored in resource_metadata as 'resource_metadata.http_header_$name', where $name is a name of the header with '-' replaced by '_'. This is done using 'metadata_headers' option in middleware configuration, refer to :ref:`installing_manually` for details. For example, this could be used to distinguish external and internal users. You'd have to implement a custom Swift middleware that sets a proper header and just add it to metadata_headers.