response_times — Sample a URL several times and report min, median, average, max and jitter, so you can tell steady from flaky.
latency_breakdown — Split one request into DNS, TCP connect, TLS handshake and time-to-headers, and say which stage is slowest.
content_check — Audit a page's title, meta description, canonical, lang, viewport, headings, image alt text and word count.
redirect_chain — Every hop from the URL you give to the URL that finally answers, with timing and loop detection.
headers_report — Grouped response headers — origin, caching and CDN, compression, security and cookies — with what looks wrong.
endpoint_summary — One call for a whole endpoint: reachable or not, latency stages, TLS certificate age and DNS address.
certificate_info — Read the TLS certificate a host presents: subject, issuer, validity and days left, chain length, SAN list and whether Node trusts it.
dns_records — Look up a domain's A, AAAA, CNAME, MX, TXT, NS and CAA records at once and report its SPF and DMARC status.
port_check — Test whether TCP ports accept a connection, with the time each port took and the reason a port is closed.
tls_versions — Check whether a host still negotiates TLS 1.2 and TLS 1.3, and which protocol and cipher it picks for each.