This patch adds a new /agent/v1/metrics that will return metrics on the
running Vault agent. Configuration is done using the same telemetry
stanza as the Vault server. For now default runtime metrics are
returned with a few additional ones specific to the agent:
- `vault.agent.auth.failure` and `vault.agent.auth.success` to monitor
the correct behavior of the auto auth mechanism
- `vault.agent.proxy.success`, `vault.agent.proxy.client_error` and
`vault.agent.proxy.error` to check the connection with the Vault server
- `vault.agent.cache.hit` and `vault.agent.cache.miss` to monitor the
cache
Closes https://github.com/hashicorp/vault/issues/8649
Co-authored-by: Theron Voran <tvoran@users.noreply.github.com>
* port SSCT OSS
* port header hmac key to ent and generate token proto without make command
* remove extra nil check in request handling
* add changelog
* add comment to router.go
* change test var to use length constants
* remove local index is 0 check and extra defer which can be removed after use of ExternalID
* implement SSRF protection header
* add test for SSRF protection header
* cleanup
* refactor
* implement SSRF header on a per-listener basis
* cleanup
* cleanup
* creat unit test for agent SSRF
* improve unit test for agent SSRF
* add VaultRequest SSRF header to CLI
* fix unit test
* cleanup
* improve test suite
* simplify check for Vault-Request header
* add constant for Vault-Request header
* improve test suite
* change 'config' to 'agentConfig'
* Revert "change 'config' to 'agentConfig'"
This reverts commit 14ee72d21fff8027966ee3c89dd3ac41d849206f.
* do not remove header from request
* change header name to X-Vault-Request
* simplify http.Handler logic
* cleanup
* simplify http.Handler logic
* use stdlib errors package
