Export Hashicorp Vault metrics to Prometheus.

Acknowledgements: this is a fork/copy of the code from the deleted github repository https://github.com/grapeshot/vault_exporter as it was mid-2019 before it got deleted

Example dashboards and alerts for this exporter are included in the mixin directory, in the form of a jsonnet monitoring mixin. They are designed to be combined with the prometheus-ksonnet package.

To install this mixin, use ksonnet:

$ ks registry add vaulteexporter https://github.com/app-sre/vault-exporter
$ ks pkg install vault-exporter/vault-mixin

Then to use, in your main.jsonnet file:

local prometheus = (import "prometheus-ksonnet/prometheus-ksonnet.libsonnet");
local vault = (import "vault-mixin/mixin.libsonnet");

prometheus + vault {
  jobs+: {
    vault: "<my vault namespace>/<my value name label>",
  },
}

$ ./vault-exporter -h
usage: vault-exporter [<flags>]

Flags:
  -h, --help              Show context-sensitive help (also try --help-long and --help-man).
      --web.listen-address=":9410"
                          Address to listen on for web interface and telemetry.
      --web.telemetry-path="/metrics"
                          Path under which to expose metrics.
      --vault-tls-cacert=VAULT-TLS-CACERT
                          The path to a PEM-encoded CA cert file to use to verify the Vault server SSL certificate.
      --vault-tls-client-cert=VAULT-TLS-CLIENT-CERT
                          The path to the certificate for Vault communication.
      --vault-tls-client-key=VAULT-TLS-CLIENT-KEY
                          The path to the private key for Vault communication.
      --insecure-ssl      Set SSL to ignore certificate validation.
      --log.level="info"  Only log messages with the given severity or above. Valid levels: [debug, info, warn, error, fatal]
      --log.format="logger:stderr"
                          Set the log target and format. Example: "logger:syslog?appname=bob&local=7" or "logger:stdout?json=true"
      --version           Show application version.

Note that environment variables can be overwritten by flags.

• VAULT_ADDR – Sets the address of Vault in the client, The format of address should be "://:" (defaults to https://127.0.0.1:8200)
• VAULT_CACERT – CACert is the path to a PEM-encoded CA cert file to use to verify the Vault server SSL certificate (defaults to empty)
• VAULT_CAPATH – CAPath is the path to a directory of PEM-encoded CA cert files to verify the Vault server SSL certificate (defaults to empty)
• VAULT_CLIENT_CERT – ClientCert is the path to the certificate for Vault communication (defaults to empty)
• VAULT_CLIENT_KEY – ClientKey is the path to the private key for Vault communication (defaults to empty)
• VAULT_CLIENT_TIMEOUT – Timeout is for setting custom timeout parameter in the Http-client (defaults to 0)
• VAULT_SKIP_VERIFY – SkipVerify enables or disables SSL verification (defaults to false)
• VAULT_TLS_SERVER_NAME – TLSServerName, if set, is used to set the SNI host when connecting via TLS (defaults to empty)
• VAULT_MAX_RETRIES – MaxRetries controls the maximum number of times to retry when a 5xx error occurs (defaults to 0)
• VAULT_TOKEN – Token is the access token used by client