Telemetry
Gather relevant insights about your application and modules with custom metrics and telemetry.
The Cosmos SDK enables operators and developers to gain insight into the performance and behavior of
their application through the use of the telemetry package. To enable telemetrics, set telemetry.enabled = true in the app.toml config file.
The Cosmos SDK currently supports enabling in-memory and prometheus as telemetry sinks. In-memory sink is always attached (when the telemetry is enabled) with 10 second interval and 1 minute retention. This means that metrics will be aggregated over 10 seconds, and metrics will be kept alive for 1 minute.
To query active metrics (see retention note above) you have to enable API server (api.enabled = true in the app.toml). Single API endpoint is exposed: http://localhost:1317/metrics?format={text|prometheus}, the default being text.
Emitting metrics​
If telemetry is enabled via configuration, a single global metrics collector is registered via the go-metrics library. This allows emitting and collecting metrics through simple API. Example:
func EndBlocker(ctx sdk.Context, k keeper.Keeper) {
defer telemetry.ModuleMeasureSince(types.ModuleName, time.Now(), telemetry.MetricKeyEndBlocker)
// ...
}
Developers may use the telemetry package directly, which provides wrappers around metric APIs
that include adding useful labels, or they must use the go-metrics library directly. It is preferable
to add as much context and adequate dimensionality to metrics as possible, so the telemetry package
is advised. Regardless of the package or method used, the Cosmos SDK supports the following metrics
types:
- gauges
- summaries
- counters
Labels​
Certain components of modules will have their name automatically added as a label (e.g. BeginBlock).
Operators may also supply the application with a global set of labels that will be applied to all
metrics emitted using the telemetry package (e.g. chain-id). Global labels are supplied as a list
of [name, value] tuples.
Example:
global-labels = [
["chain_id", "chain-OfXo4V"],
]
Cardinality​
Cardinality is key, specifically label and key cardinality. Cardinality is how many unique values of something there are. So there is naturally a tradeoff between granularity and how much stress is put on the telemetry sink in terms of indexing, scrape, and query performance.
Developers should take care to support metrics with enough dimensionality and granularity to be useful, but not increase the cardinality beyond the sink's limits. A general rule of thumb is to not exceed a cardinality of 10.
Consider the following examples with enough granularity and adequate cardinality:
- begin/end blocker time
- tx gas used
- block gas used
- amount of tokens minted
- amount of accounts created
The following examples expose too much cardinality and may not even prove to be useful:
- transfers between accounts with amount
- voting/deposit amount from unique addresses
Supported Metrics​
| Metric | Description | Unit | Type |
|---|---|---|---|
tx_count | Total number of txs processed via DeliverTx | tx | counter |
tx_successful | Total number of successful txs processed via DeliverTx | tx | counter |
tx_failed | Total number of failed txs processed via DeliverTx | tx | counter |
tx_gas_used | The total amount of gas used by a tx | gas | gauge |
tx_gas_wanted | The total amount of gas requested by a tx | gas | gauge |
tx_msg_send | The total amount of tokens sent in a MsgSend (per denom) | token | gauge |
tx_msg_withdraw_reward | The total amount of tokens withdrawn in a MsgWithdrawDelegatorReward (per denom) | token | gauge |
tx_msg_withdraw_commission | The total amount of tokens withdrawn in a MsgWithdrawValidatorCommission (per denom) | token | gauge |
tx_msg_delegate | The total amount of tokens delegated in a MsgDelegate | token | gauge |
tx_msg_begin_unbonding | The total amount of tokens undelegated in a MsgUndelegate | token | gauge |
tx_msg_begin_begin_redelegate | The total amount of tokens redelegated in a MsgBeginRedelegate | token | gauge |
tx_msg_ibc_transfer | The total amount of tokens transferred via IBC in a MsgTransfer (source or sink chain) | token | gauge |
ibc_transfer_packet_receive | The total amount of tokens received in a FungibleTokenPacketData (source or sink chain) | token | gauge |
new_account | Total number of new accounts created | account | counter |
gov_proposal | Total number of governance proposals | proposal | counter |
gov_vote | Total number of governance votes for a proposal | vote | counter |
gov_deposit | Total number of governance deposits for a proposal | deposit | counter |
staking_delegate | Total number of delegations | delegation | counter |
staking_undelegate | Total number of undelegations | undelegation | counter |
staking_redelegate | Total number of redelegations | redelegation | counter |
ibc_transfer_send | Total number of IBC transfers sent from a chain (source or sink) | transfer | counter |
ibc_transfer_receive | Total number of IBC transfers received to a chain (source or sink) | transfer | counter |
ibc_client_create | Total number of clients created | create | counter |
ibc_client_update | Total number of client updates | update | counter |
ibc_client_upgrade | Total number of client upgrades | upgrade | counter |
ibc_client_misbehaviour | Total number of client misbehaviours | misbehaviour | counter |
ibc_connection_open-init | Total number of connection OpenInit handshakes | handshake | counter |
ibc_connection_open-try | Total number of connection OpenTry handshakes | handshake | counter |
ibc_connection_open-ack | Total number of connection OpenAck handshakes | handshake | counter |
ibc_connection_open-confirm | Total number of connection OpenConfirm handshakes | handshake | counter |
ibc_channel_open-init | Total number of channel OpenInit handshakes | handshake | counter |
ibc_channel_open-try | Total number of channel OpenTry handshakes | handshake | counter |
ibc_channel_open-ack | Total number of channel OpenAck handshakes | handshake | counter |
ibc_channel_open-confirm | Total number of channel OpenConfirm handshakes | handshake | counter |
ibc_channel_close-init | Total number of channel CloseInit handshakes | handshake | counter |
ibc_channel_close-confirm | Total number of channel CloseConfirm handshakes | handshake | counter |
tx_msg_ibc_recv_packet | Total number of IBC packets received | packet | counter |
tx_msg_ibc_acknowledge_packet | Total number of IBC packets acknowledged | acknowledgement | counter |
ibc_timeout_packet | Total number of IBC timeout packets | timeout | counter |
store_iavl_get | Duration of an IAVL Store#Get call | ms | summary |
store_iavl_set | Duration of an IAVL Store#Set call | ms | summary |
store_iavl_has | Duration of an IAVL Store#Has call | ms | summary |
store_iavl_delete | Duration of an IAVL Store#Delete call | ms | summary |
store_iavl_commit | Duration of an IAVL Store#Commit call | ms | summary |
store_iavl_query | Duration of an IAVL Store#Query call | ms | summary |